Question

what could a wounded gladiator do to ask for mercy? shout for help lift his finger bow to the emperor raise his sword

Explanation:

In ancient Roman gladiatorial contests, a wounded gladiator would ask for mercy by raising a finger (specifically, the index finger). Shouting for help was not the customary gesture, bowing to the emperor wasn't the mercy - seeking action in the arena context, and raising the sword would imply readiness to fight, not seeking mercy.

Answer:

B. Lift his finger