Which of the Following Ways of Investigating the Topic of Communication

Which of the following ways of investigating the topic of communication in cults is an example of rhetorical criticism?

A) Join a cult and observe cult members as they communicate.
B) Analyze the values in the cult leaders' speeches.
C) Send questionnaires to ex-members asking them to describe why they joined the cult and what they communicated about in the cult.
D) Take transcripts from cult members' diaries and perform these transcripts before an audience.