Which of the following is not a sign of attention -deficit/hyperactivity disorder, or adhd?
a) fidgeting or squirming while seated
b) being easily distracted
c) washing hands when they are already clean
d) talking excessively and interrupting others

What isn't a sign of Attention-deficit/hyperactivity disorder nor ADHD would be washing hands when they are already clean - C. this sounds more like a symptom someone who has OCD would exhibit. Such people tend to exhibit symptoms that are similar to what you wrote more often. 

Ithink it's d or it can be itger