David Had His Laptop Open,was Working on a Paper and Checking

Multiple Choice

David had his laptop open,was working on a paper and checking out his favorite set of websites. All of a sudden his phone rings and it is his mother. So,during the conversation with his mother,he answers by saying,"ummm hmmm," "yeah," "sure," "ummm hmmm" all because he was really focused on the websites open on his laptop. David is engaged in 

A) pseudolistening
B) monopolizing
C) selective listening
D) defensive listening
E) literal listening