Kim Is a Criminology Student

Kim is a criminology student.During a classroom lecture,Kim's phone starts ringing out loud.When she answers the call instead of disconnecting it,the professor stops the lecture and glares at her till she hangs up.Kim gets embarrassed and sinks into her seat.Kim's behavior is a violation of a:

A) social norm.
B) crime.
C) behavioral rule.
D) public rule.