Which of the following is the best example of a heroic act in Morte d'Arthur by Sir Thomas Malory?

Below are the choices that can be found elsewhere:

a) Sir Mordred distrusts the peace treaty that King Arthur has arranged.

b) Sir Bedivere lies to King Arthur about throwing the sword in the lake.

c) King Arthur and the traitor Sir Mordred fight to the death.

d) The hermit buries a dead body in a little chapel.

The answer is A