Adversity teaches man to be humble and self-reliant.

Answer: Option A

Adversity : a difficult or unpleasant situation.
Prosperity : the state of being prosperous.
Curiosity : a strong desire to know or learn something.
Animosity : strong hostility.
Sincerity : the absence of pretence, deceit, or hypocrisy.

Antonym of Adversity is Prosperity