Meaning: 'Short-term' refers to a limited duration, indicating that the weight loss achieved through financial incentives may not be sustainable in the long run.

Wrong options:

• foursome: 'Foursome' refers to a group of four people and does not relate to weight loss or timeframes, making it contextually irrelevant.
• hoodlum: 'Hoodlum' denotes a person involved in crime or violence, which is unrelated to the topic of dieting and weight loss.
• ovum: 'Ovum' is a biological term referring to a female reproductive cell, which has no connection to the context of weight loss.

Correct answer: according

Explanation: 'According' is used to attribute information to a source, fitting grammatically and contextually as it introduces the findings of a study.

Meaning: 'According' means 'as stated by' or 'in agreement with,' indicating that the following information is based on the referenced study.

Wrong options:

• clawing: 'Clawing' implies a physical action and does not fit grammatically or contextually in this sentence about research findings.
• proposing: 'Proposing' suggests suggesting or putting forward an idea, which does not align with the context of reporting study results.
• apposing: 'Apposing' means placing side by side, which is not relevant to the context of citing a study's findings.

Correct answer: subjects

Explanation: 'Subjects' is the correct term as it refers to individuals participating in a study, fitting both grammatically and contextually within the sentence.

Meaning: 'Subjects' refers to the participants in a research study who are being observed or tested.

Wrong options:

• subunits: 'Subunits' refers to smaller parts of a whole and does not accurately describe participants in a study.
• dustbins: 'Dustbins' are containers for waste, which is completely unrelated to the context of a research study.
• tonics: 'Tonics' are medicinal substances, which do not fit the context of individuals involved in a weight loss study.

Correct answer: invested

Explanation: 'Invested' is appropriate as it indicates that participants put their own money into the program, aligning with the context of financial commitment to weight loss.

Meaning: 'Invested' means to allocate money with the expectation of achieving a benefit, in this case, weight loss.

Wrong options:

• amended: 'Amended' means to change or modify, which does not fit the context of participants putting money into a weight loss program.
• evanescent: 'Evanescent' describes something fleeting or temporary, which does not relate to the action of putting money into a program.
• contradicted: 'Contradicted' means to assert the opposite, which is irrelevant in the context of participants financially engaging in a weight loss effort.

Correct answer: incentive

Explanation: 'Incentive' is the correct term as it refers to a motivation or encouragement to act, fitting grammatically and contextually in the sentence about weight loss.

Meaning: 'Incentive' means something that motivates or encourages someone to do something, in this case, losing weight.

Wrong options:

• possessive: 'Possessive' refers to ownership and does not relate to motivation or encouragement in the context of dieting.
• poetics: 'Poetics' refers to the art of poetry, which is unrelated to the concept of motivation for weight loss.
• oppresses: 'Oppresses' means to keep someone in subservience or hardship, which does not fit the context of providing motivation for dieting.

Correct answer: Followed

Explanation: 'Followed' is the correct choice as it indicates the sequence of results, fitting grammatically and contextually within the sentence structure.

Meaning: 'Followed' means to come after something in order or sequence, indicating that the next group had a different outcome.

Wrong options:

• Matchwood: 'Matchwood' is not a relevant term in this context and does not convey any meaning related to the sequence of results.
• Lapboard: 'Lapboard' refers to a flat surface for writing or working on one's lap, which is unrelated to the context of dieting results.
• Sorrowed: 'Sorrowed' means to feel or express sorrow, which does not fit the context of discussing the outcomes of a weight loss study.