Christie Shows Male and Female Participants Sad Movie Scenes

Christie shows male and female participants sad movie scenes. Participants view some scenes alone and some in the company of an experimental confederate. She covertly records participants' facial expressions in both conditions. What is the dependent variable? What might she predict?

A) The dependent variable is whether the scenes were viewed in public or in private. She might predict that both the males and the females will display the same amount of sadness in public as in private.
B) The dependent variable is whether the scenes were viewed in public or in private. She might predict that the males but not the females will display less sadness in public than in private.
C) The dependent variable is facial expressions. She might predict that both the males and the females will display the same amount of sadness in public as in private.
D) The dependent variable is facial expressions. She might predict that the males but not the females will display less sadness in public than in private.