The Primary Reason That Men Who Live in the Southern

The primary reason that men who live in the southern United States are more aggressive than men who live in the northern United States men is that:

A) Southern men have slightly higher baseline levels of testosterone than do Northern men.
B) Southern men are taught to react aggressively to acquire resources based on previous learning experiences.
C) Southern men are taught to react aggressively when they feel their status has been challenged.
D) it is hotter in the South than it is in the North.