Mohini was often teased as corpulent by her friends.

Answer: Option B

Corpulent : (of a person) fat.
Belligerent : hostile and aggressive.
Gaunt : (of a person) lean and haggard, especially because of suffering, hunger, or age.
Garrulous : excessively talkative, especially on trivial matters.
Fat : a natural oily substance occurring in animal bodies, especially when deposited as a layer under the skin or around certain organs.

Antonym of Corpulent is Gaunt