Depth Interviews Suffer from Many of the Disadvantages of Focus

Depth interviews suffer from many of the disadvantages of focus groups and often to a greater extent. Which of the following disadvantages is not shared with focus groups?

A) The data obtained are difficult to analyze and interpret.
B) Skilled interviewers capable of conducting depth interviews are expensive and difficult to find.
C) The lack of structure makes the results susceptible to the interviewer's influence.
D) All of the above are shared with focus groups.