If you want the quality of your writings to improve, then avoid redundant words.

A. unwilling

B. mistaken

C. wrong

D. unnecessary

Answer: Option D

Solution(By Examveda Team)

Unwilling : not ready, eager, or prepared to do something.
Mistaken : wrong in one's opinion or judgement.
Wrong : not correct or true; incorrect.
Unnecessary : not needed.
Redundant : not or no longer needed or useful; superfluous.

Synonym of Redundant is Unnecessary