Correct Answer: Fatalist

Solution : The correct choice will be the first option.

The one-word substitute for the group of words is "fatalist".

Fatalist: A fatalist is a person who believes that events are predetermined and inevitable and that one's life is governed by fate. A fatalist accepts whatever happens as unavoidable.

The meanings of other terms are:

Fastidious: This term refers to a person who is very attentive to and concerned about accuracy and detail. It does not convey the idea of believing in fate.

Fugitive: A fugitive is someone who is fleeing or evading capture, usually from the law. This term is unrelated to the belief in fate.

Fanatic: A fanatic is an excessively enthusiastic and dedicated person, often to a particular cause or belief. It doesn't specifically relate to a belief in fate.