A person who maliciously destroys by fire

A. Antagonist

B. Activist

C. Terrorist

D. Incendiary

Answer: Option D

Solution(By Examveda Team)

One word substitute is Incendiary.

Antagonist: a person who actively opposes or is hostile to someone or something; an adversary.
Activist: a person who campaigns to bring about political or social change.
Terrorist: a person who uses unlawful violence and intimidation, especially against civilians, in the pursuit of political aims.
Incendiary: a person who starts fires.