Meaning: 'Predictor' refers to a factor that can indicate or forecast an outcome, in this case, the success of relationships based on tone of voice.

Wrong options:

• symptom: 'Symptom' refers to a sign of a condition or problem, which does not fit the context of forecasting relationship success.
• heritage: 'Heritage' relates to cultural background or legacy, which is unrelated to the predictive nature of tone in communication.
• narrator: 'Narrator' refers to a person telling a story, which does not apply to the context of assessing relationship success.

Correct answer: composed

Explanation: The word 'composed' is an adjective that describes something made up of various parts, fitting grammatically and contextually as it refers to the four elements that make up tone of voice.

Meaning: 'Composed' means made up of or formed from various elements, indicating that tone of voice consists of four specific components.

Wrong options:

• concentrated: 'Concentrated' implies a focus or intensity, which does not accurately describe the nature of tone as a combination of elements.
• reduced: 'Reduced' suggests something has been made smaller or less, which contradicts the idea of tone being made up of multiple elements.
• organized: 'Organized' implies a systematic arrangement, which does not specifically convey the idea of being made up of distinct components.

Correct answer: convey

Explanation: The verb 'convey' fits grammatically as it indicates the action of expressing or communicating something, aligning perfectly with the context of how tone communicates attitude and emotion.

Meaning: 'Convey' means to communicate or make known, particularly in relation to feelings or intentions through tone of voice.

Wrong options:

• commence: 'Commence' means to begin, which does not relate to the action of expressing or communicating in this context.
• reminisce: 'Reminisce' refers to recalling past experiences, which is not relevant to the act of conveying current emotions or attitudes.
• displace: 'Displace' means to move something from its place, which does not fit the context of communication.

Correct answer: Whether

Explanation: The word 'Whether' serves as a conjunction that introduces alternatives or conditions, fitting grammatically and contextually to present different scenarios regarding the use of tone in communication.

Meaning: 'Whether' indicates a choice or condition between options, in this case, the various goals one might have in communication.

Wrong options:

• Due to: 'Due to' indicates a reason or cause, which does not fit the conditional context of presenting options.
• Unless: 'Unless' introduces a condition that negates something, which does not align with the intent of presenting various goals in communication.
• No matter: 'No matter' suggests disregard for conditions, which does not appropriately introduce the alternatives being discussed.