Select the most appropriate ANTONYM of the highlighted word in the sentence.
The idea of investing all of his life savings in a risky startup seemed like an act of lunacy to his financial advisor.

Correct option is A

The correct antonym of the given word is (a) Sanity.
Given word – Lunacy: Extreme foolishness or mental illness. (पागलपन / मूर्खता)
Example: Spending all his salary in one night was an act of lunacy.
Correct antonym – Sanity: Sound mental health and rational thinking. (समझदारी / विवेक)
Example: After a long rest, he regained his sanity.
Synonyms of Lunacy: madness, insanity, folly, absurdity.
Antonyms: sanity, sense, wisdom, logic.
Meanings of other options:
· (b) Dismay – Shock or distress (घबराहट)
· (c) Delusion – False belief (भ्रम)
· (d) Insanity – Synonym, not antonym (पागलपन)