Bryan Finds That,where He Used to Need Only One,he Now

Multiple Choice

Bryan finds that,where he used to need only one,he now needs two or more sleeping pills to fall asleep.What does this indicate

A)  He has become psychologically addicted to sleeping pills. 
B)  He is using sleeping pills as a recreational drug. 
C)  He has become physically addicted to sleeping pills. 
D)  He has developed a tolerance to sleeping pills.