Which quotation from “A Horseman in the Sky” shows how Carter Druze's father advances the plot of the story? “The face of the rider,...showed only an outline...was looking downward to the bottom of the valley.” "'Virginia, to which you are a traitor, must get on without you.'" "'Should we both live to the end of the war, we will speak further of the matter.'" "'Well, go, sir, and, whatever may occur, do what you conceive to be your duty.'"