<span>The change came before World War Two rather than after the War. President Roosevelt and his advisors concluded that the United States needed to become involved in foreign affairs in both the Atlantic and the Pacific theaters. In the Atlantic sector, the key blow was the fall of France. This meant that the only anti-Nazi power in Europe was Britain. Even though Britain managed to weather the first great crisis, the Battle of Britain, Prime Minister Churchill knew that the British could not go on without help. The British simply could not maintain sufficient manufacturing, especially of big capital projects, without assistance. </span>
The proclamation of 1763 forbade colonists from crossing the appalachian mountains, because Great Britain decided that if the colonists took too much land, the Indians would attack, and Britain did not want to be at war with the Indians, especially after the costly fight with France, which left their coffers (money) empty
hope this helps
For me, both B and D make sense. Do you have any text I can read?