Select the option that can be used as a one-word substitute for the given group of words.
A person who renounces a religious or political belief or principle.

* Apostate: A person who renounces or abandons a religious or political belief or principle.
Agnostic: A person who believes that nothing is known or can be known of the existence or nature of God.

Ascetic: A person who practices severe self-discipline and abstention from all forms of indulgence, typically for religious reasons.

Atheist: A person who disbelieves or lacks belief in the existence of God or gods.