Malamuth, in His Study on Sexual Aggression, Found That His

Malamuth, in his study on sexual aggression, found that his ability to explain the variance in participants' sexual aggression scores almost doubled (from .38 to .75) when:

A) he dropped the tumescence rape index from his analysis of predictors.
B) he included the non-volunteers in his analysis.
C) he included the interactions between the predictor variables in his analysis.
D) sexual dominance scores were taken into account as a predictor score.