What are the limitations of employing online focus groups?

(A)  Easy access to conference sites can be set up.

(B)  E-mail interviews with people in different time zones will be extremely participatory.

(C)  Drop outs may affect the data quality.

(D)  The approach is confined to the people who are willing to participate.

(E)  External influences on participants can be found.

Choose the correct answer from the options given below: