DrHayek Conducts a Meta-Analysis Where She Combines 54 Laboratory Studies

Dr.Hayek conducts a meta-analysis where she combines 54 laboratory studies in which men who watched an erotic film were then asked whether or not they wanted to engage in casual sex.She finds a moderate effect,such that men who see erotic films increase their desire for casual sex.What is one weakness of this study?

A) She can't be sure that the results are not due to random chance in some studies.
B) She can't be certain that the results were not due to the particular films used.
C) She can't be sure that the results were not due to the measures of desire for casual sex used.
D) She can't easily generalize her findings to the real world.