Plase help (NO LINKS) How much did the US give to the Allied Powers to fight in WWII?

Why was the attack on Pearl Harbor so significant that made the US enter WWII? ​

im going to go with b.

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

climate change is the big reason to the decline of the indus valley which also caused floods. so i dont know what answer would best fit the description thats just what i found online! have an awesome