Final answer:
Interviewers aim to increase rapport to enhance data quality in research interviews. Rapport builds trust and encourages honesty, complementing the overall reliability and validity of the data collected.
Step-by-step explanation:
Interviewers take steps to increase rapport, or feelings of connection and trust between the interviewer and participant, to increase data quality. The correct option is c) Rapport. Building rapport is essential in research interviews as it fosters a sympathetic and harmonious relationship, encouraging participants to be more open and truthful, thus improving the quality of the information collected. Reliability and validity are also important in data collection. Reliability is about the consistency of a measure, where results are likely to be replicated if a study is reproduced. On the other hand, validity refers to how well the study measures what it was designed to measure, making sure that the research accurately examines the intended subject matter.