Drill Instructors in the Military Often Yell at New Recruits

Drill instructors in the military often yell at new recruits and try to humiliate them.In contrast,this behaviour would never be tolerated from a kindergarten teacher,who is expected to be patient and nurturing.The behaviour of both drill instructors and kindergarten teachers are examples of

A) social roles.
B) conformity.
C) obedience.
D) social norms.