Question

Those willing to kill or die for a cause have often lost any ability to think

rationally or morally. Such a person might be described as a
OA) loyalist
OB) sniper.
OC) fanatic.
OD) convert.

Answer 1

This is such know as a fanatic.

Explanation: How i know this is if you were to such up every answer on Google then you would see fanatic would make more sense.