Assuming this was the same post made before, this poster is pushing Americans to avenge the bombing of Pearl Harbor by the Japanese by committing to the war effort.
The best reason as to why the caliphs demonstrated religious tolerance to Jews and Christians would be because "D. the caliphs knew freedom of worship led to an overall stronger empire," since allowing people to worship freely meant that they were less likely to rebel against the state.
The answer is all of these are results of the war
Aided europe financially , prevented spread of communism
