A martyr is a person who is a.
put to death or endures great suffering on behalf of their beliefs, principles, or a cause.
b.
killed for his/her faith, but is later recognized as a victim of injustice.
c.
that commissions a work of religious art in order to spread specific beliefs.
d.
suffers at the hand of an enemy, but is considered a saint among their people.

A.

Explanation:

A martyr is also someone who chooses to be put to death rather than renounce his or her religious beliefs, as the story of Saint Stephen tells. In the figurative sense, if you are a martyr to headaches, you suffer from them.

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