An advantage of using a panel for marketing research is
A the discussion leader can help change negative panel responses into positive ones.
B panel members often help each other by bringing up ideas for discussion that others didn't initially think of, but that were important to them.
C there will usually be one panel member who dominates the discussion to help keep the conversation focused.
D researchers can take successive measurements of consumers to determine if they change their purchasing behaviors over time.
E the panel's continuity and representativeness of the population are unchanged when individual members drop out.
Answer: D researchers can take successive measurements of consumers to determine if they change their purchasing behaviors over time.