Answer:
The answer is d) obsessive-compulsive disorder.
Step-by-step explanation:
When someone suffers from this disorder, he/she will probably have unwanted thoughts or ideas that will drive them to do something repeatedly --in Sid's case, he washes his hands every time he thinks of germs.
After the person has done the action (called compulsions), he/she will only experience a short-term relief. The toughts will come back. Not carrying out the behaviours might result in deep anxiety and stress.