Smoke filling up a room is indeed an example of diffusion. Diffusion occurs when two or more sets of molecules intermingle and spread out. In this case, it would be the smoke molecules interacting and spreading out among the air molecules.
A. He reflects back and describes his initial optimism of the war.
Everyone initially feels that optimism going into a battle. The idea of victory is something easy to see. But it gives the idea that possibly it may not turn out exactly as he hopes in the final sentence.
Answer:
the answer is the last one
Lol I Probably Wouldn't Say Anything , I Would Just Run !