Which of the Following Statements Best Describes Focus Group Interviews

Which of the following statements best describes focus group interviews?

A) They are usually used less frequently than personal observations.
B) They are a type of quantitative research method used in capturing consumer attitudes and preferences.
C) They are generally more cost effective than any other type of conclusive research methods.
D) They systematically manipulate one or more variables to determine which variable(s) have a causal effect on another variable.
E) They usually require researchers to record the interactions of the interviews on a videotape or audiotape for later analysis.