What Is One Possible Factor in the Observation That Boys

What is one possible factor in the observation that boys tend to be more aggressive than girls?

A) Girls are given more tasks, and therefore spend more time around adults.
B) Girls are usually given a better diet, which reduces frustration associated with malnutrition.
C) Girls are rarely supervised, which leads them to independent decision-making at a younger age.
D) Girls are as aggressive as boys, but are generally more skilled at hiding it from adults.