A Drawback of Personal (In-Depth)interviews as a Data Collection Method

Multiple Choice

A drawback of personal (in-depth) interviews as a data collection method in marketing research is that:

A) they have a high cost per contact for every respondent studied.
B) they do not generate as many ideas as group methods do.
C) they have an element of confusion as there is high geographic dispersion.
D) they have a lesser depth of response than other interviews.