International destruction of racial groups:

Matricide
Regicide
Genocide
Homicide

The correct answer is C. Genocide.

Genocide is the intentional destruction of a people, usually defined as an ethnic, national, racial, or religious group. It can be carried out by killing members of the group, causing serious bodily or mental harm to members of the group, deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part, imposing measures intended to prevent births within the group, or forcibly transferring children of the group to another group.

A. Matricide is the killing of one’s mother.
B. Regicide is the killing of a king or queen.
D. Homicide is the killing of another human being.