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.

Sleeping Pills

Medications designed to help individuals fall asleep or stay asleep, often used in the treatment of various sleep disorders.

Develop A Tolerance

The process by which the body increasingly adapts to a substance (such as a drug or alcohol), requiring larger doses to achieve the original effect.

Psychologically Addicted

A condition where an individual experiences a compulsive need for a substance, behavior, or activity, driven by psychological cravings rather than physical dependence.