IRONIC

A. Inflexible

B. Bitter

C. Good-natured

D. Sarcastic

Answer: Option D

Solution(By Examveda Team)

Inflexible : unwilling to change or compromise.
Bitter : having a sharp, pungent taste or smell; not sweet.
Good-natured : kind, friendly, and patient.
Sarcastic : Ironic.
Ironic : marked by or given to using irony in order to mock or convey contempt.

Synonym of Ironic is Sarcastic