The correct answer is A. sanity.
Sanity is the state of being mentally sound and healthy. It is the opposite of insanity, which is a mental disorder characterized by a lack of mental soundness.
Normality is the state of being usual, typical, or common. It is not the opposite of insanity, as insanity is not a normal state of being.
Lucidity is the state of being clear-headed and mentally alert. It is not the opposite of insanity, as insanity does not necessarily mean that a person is not clear-headed or mentally alert.
Sobriety is the state of being free from the effects of alcohol or drugs. It is not the opposite of insanity, as insanity does not necessarily mean that a person is under the influence of alcohol or drugs.
In conclusion, the correct answer to the question “Antonym of INSANITY” is A. sanity.