Russia once saw the face of hell. Within the spirits of Satan. Everywhere he lurks, and Russia has been one of them.
Well they began considering it because they didn't want another armed revolt like the Americas did. So they peacefully let them leave. Also they let them leave so they could be allies and be valuable trading partners. Also they knew they had enough to deal with like the threat of the cold war bombing. Plus they didn't want India turning to Soviet communism influence. This a basic summary of why they peacefully seceded India and let them become their own country.
England proved to be a strong super power by conquering lands and by acquiring natural resources. England also imperialized many countries benefitting from them through mercantilism. England increased in navy and their economy prospered.
The world war two broke out when Germany invaded Poland. Britain and France consequently declared war on Germany to enforce the terms of the Versailles treaty. but they were already late because their appeasement policy had already served to militarize and arm Germany.
C is the answer to the question