Kabeio said:
yes, interviews may not be a very quick method to gather data, but i disagree with the fact that personal contact creates more accurate data as people may feel more intimidated, and it loses the advantage of anonymity as people know that you now know them
No, another point is that the interviewer can use active listening to make sure the data is accurate. With questionnaires for example the results can be misinterpreted.
The rest of the choices are wrong
A- They are extremely expensive, say you have to interview 1000 people, imagine the cost of hiring the interviewer, scheduling time for the workers to be interviewed etc,
B-Large amounts, its not like its a fast food service where you just go in, answer a few questions, interviews are used by detailed analysis.
C- Above
D- Obvious