Answer:
d. One who faces adventures in pursuit of virtues we respect
Step-by-step explanation:
The epic hero must be born from a family that is noble in some way, so it can't be c, and we're not talking about an epic poem, we're talking about an epic hero, so it can't be b. That leaves only a or d, and epic heroes must be brave or heroic in some way, thus d would be the most logical answer.