Which phrase in this excerpt from ambrose bierce's "an occurrence at owl creek bridge" highlights the use of everyday characters in realism?

meanwhile he did what he could. no service was too humble for him to perform in the aid of the south, no adventure too perilous for him to undertake if consistent with the character of a civilian who was at heart a soldier, and who in good faith and without too much qualification assented to at least a part of the frankly villainous dictum that all is fair in love and war.

one evening while farquhar and his wife were sitting on a rustic bench near the entrance to his grounds, a gray-clad soldier rode up to the gate and asked for a drink of water.

a. no service was too humble for him to perform
b. no adventure too perilous for him to undertake
c. a part of the frankly villainous dictum
d. a gray-clad soldier rode up to the gate