What is ironic about the ending of "Two Friends"?

A. It is revealed that the two friends are not who they claim to be.

B.The two friends are ordinary men who want nothing to do with the war, but they become heroes through their bravery.

C. The Prussian soldier lets the men go instead of killing them as he promised.

D. The Prussian soldier ends up fearing for their safety.

E. The Prussian soldiers are killed instead of the two friends.

PLEASE HELP!!!