What Happens in the Brain of an Individual Who Is

What happens in the brain of an individual who is observing the behaviour of another person,based on evidence from brain imaging

A)  Mirror neurons become active as the observer "experiences" what the model is doing. 
B)  Parietal areas become less active, as the observer becomes focused on visual processing. 
C)  Language areas become active as the observer engages in self-talk. 
D)  Subcortical areas become less active because the observer can have only emotional responses to his own behaviour.