According to the pentagon, what is the root cause of sexual assaults in the military?

According to the pentagon, the root cause of sexual assaults in the military is: The failure of commanding officers to recognize the severity of sexual harassment, violence, and assault.
In the mind of the commanding officers, every military personals must have a rock solid mental strength to be considered as suitable soldiers. But when someone felt undignified because of the sexual assaults, doesn't mean that that person is anywhere less mentally strong compared to other soldiers

Ithink it's a, but i might be wrong