Sharon Has Always Insisted That She Can Study Effectively While

Sharon has always insisted that she can study effectively while watching television. She tends to look up from her studies every few minutes to see what is happening on her TV program. Why is this an inefficient study technique?

A) She is constantly switching her attention from her studies to the TV and is losing most of her study time.
B) Every time she switches her attention to the TV, she moves to a lower level of concentration, so she is spending too little time in deep concentration.
C) Everyone knows that you simply can't do two things at one time.
D) It would be more efficient to switch back and forth from study to TV every ten minutes instead.