Each Night as Leo Gets in Bed, He Has These

Each night as Leo gets in bed, he has these intrusive, unwanted thoughts that he left the stove on or the door unlocked. So, he gets up and checks, but once back in bed, he thinks that he might have accidently turned on the stove or unlocked the door while he was checking them and goes back to the kitchen again. Leo is suffering from a condition known as __________ disorder.

A) obsessive-compulsive
B) somatization
C) generalized anxiety
D) paranoid delusional