Antonym of EQUANIMITY

The correct answer is B. Duplicity.

Equanimity is a state of calmness and composure, even in difficult or challenging situations. Duplicity is the quality of being deceitful or hypocritical. It is the opposite of honesty and sincerity.

A. Excitement is a feeling of great enthusiasm or eagerness. It is the opposite of calmness and composure.
C. Dubiousness is a feeling of uncertainty or doubt. It is the opposite of certainty or conviction.
D. Resentment is a feeling of deep and bitter anger or displeasure. It is the opposite of forgiveness or tolerance.

In conclusion, the correct answer is B. Duplicity.