For the Past Two Weeks,Cameron Has Been Taking a Mild

For the past two weeks,Cameron has been taking a mild sedative to help him fall asleep.What is he likely to experience over time

A)  He will need to take a larger dose in order to fall asleep because, over time, sedatives become less effective. 
B)  He can take less of the drug because the effects of sedatives tend to be cumulative. 
C)  He will spend more of the night dreaming than he did without the sedative. 
D)  After two weeks his insomnia should be cured, and he can stop using the sedative.