Correct Option: A

sanity (Noun) : the state of having a normal healthy mind ; the state of being sensible and reasonable
lunacy (Noun) : behaviour that is stupid or crazy ; madness ; mental illness
stupidity (Noun) : behaviour that shows a lack of thought or good judgement ; the state or quality of being slow to learn and not clever/intelligent
sensibility (Noun) : the ability to experience and understand deep/feelings
insanity (Noun) : madness ; lunacy