It doesn't really stand for anything. However, D-Day was also code-named Operation Neptune in the grand plan of Operation Overlord, designed to land troops in Normandy to push Germany back out of France.
B is a good answer i think
The U.S, favored them because of the extensive trade and Germany was the aggressor meaning A person or country that attacks another first.
I think the sun and the river shared in the pattern of death and rebirth?—