Solomon Used to Experience Occasional Bouts of Insomnia

Multiple Choice

Solomon used to experience occasional bouts of insomnia.Recently he started taking sleeping pills to help him overcome the insomnia.Now he finds that he cannot get to sleep unless he takes a sleeping pill.This would suggest that Solomon:

A) has developed a drug tolerance for his sleeping pills
B) is experiencing the effects of drug withdrawal
C) has developed a drug dependency on his sleeping pills
D) has become habituated to sleeping pills