Meaning: 'Minimum' means the least or smallest amount, indicating that sedentary video games do not provide enough exercise intensity.

Wrong options:

• maximum: Maximum refers to the greatest amount, which contradicts the context of needing a lower threshold for exercise intensity.
• minima: Minima is the plural form of minimum and does not fit grammatically as the sentence requires a singular noun.
• maxima: Maxima is also a plural form and does not align with the singular context needed in this sentence.

Correct answer: replacement

Explanation: The term 'replacement' is appropriate as it indicates that active video games cannot serve as a substitute for traditional exercise. This fits contextually and grammatically, as it aligns with the idea of substituting one activity for another.

Meaning: 'Replacement' refers to something that takes the place of another, indicating that AVGs cannot fully substitute for exercise.

Wrong options:

• practice: Practice refers to the act of doing something repeatedly, which does not convey the idea of substituting one activity for another.
• employment: Employment relates to work or job roles, which is irrelevant in the context of exercise and gaming.
• engagement: Engagement implies involvement or participation, but does not convey the idea of substituting one activity for another.

Correct answer: gained

Explanation: The word 'gained' fits grammatically and contextually as it indicates an increase in weight loss, which aligns with the study's findings about the effects of replacing sedentary games with active ones.

Meaning: 'Gained' means to acquire or achieve something, in this case, referring to losing less weight over time.

Wrong options:

• lost: Lost implies a decrease in weight, which contradicts the context of the study's findings about weight management.
• retained: Retained suggests keeping the same weight, which does not align with the context of weight loss discussed in the study.
• achieved: Achieved implies reaching a goal, but does not specifically convey the idea of weight change as effectively as 'gained'.

Correct answer: helping

Explanation: The word 'helping' is grammatically correct as it indicates an ongoing action that contributes to the problem of childhood obesity. It fits contextually as it describes the role of screen time in exacerbating this issue.

Meaning: 'Helping' means to assist or contribute to something, in this case, the worsening of childhood obesity due to excessive screen time.

Wrong options:

• helped: Helped is the past tense form, which does not fit the ongoing context of the current situation regarding childhood obesity.
• valued: Valued implies worth or importance, which does not relate to the action of contributing to obesity.
• valid: Valid means acceptable or legitimate, which does not convey the idea of contributing to a problem.