Select the option that can be used as a one-word substitute for the given group of words.
The murder of a large number of people from a particular nation or ethnic group.

Correct option is C

The correct one-word substitute for "The murder of a large number of people from a particular nation or ethnic group" is "Genocide."
Genocide is the intentional action to destroy a people—usually defined as an ethnic, national, racial, or religious group—in whole or in part. (एक विशेष राष्ट्र या जातीय समूह के लोगों का बड़े पैमाने पर वध)
Example: The tragic history of the genocide against the Tutsi in Rwanda reminds us of the devastating effects of hatred.

Meanings of the given other options:
· (a) Geronticide – The killing of elderly people. (बुजुर्गों की हत्या)
· (b) Honour killing – Killing of a family member for bringing perceived shame. (इज़्ज़त के नाम पर हत्या)
· (d) Mariticide – The killing of one’s husband. (पति की हत्या)