International destruction of racial groups:

A. Matricide

B. Regicide

C. Genocide

D. Homicide

Answer: Option C

Solution(By Examveda Team)

One word substitution is Genocide.

Matricide : the killing of one's mother.
Regicide : the action of killing a king.
Homicide : the killing of one person by another.
Genocide : the deliberate killing of a large group of people, especially those of a particular nation or ethnic group.