20 Participants Take Part in an Experiment in Which They

Multiple Choice

20 participants take part in an experiment in which they rate their feeling of anxiety while listening to soft music and watching a nature film and then a violent film. They watch the same two films again whilst listening to loud rock music and again to romantic opera.
-5) In the analysis described above the interaction df will be:

A) 2
B) 6
C) 3
D) 1