What factors contributed to the United States becoming a world leader?

A.) the US winning the war & having a strong economy

B.) the allies winning the war and US having a skilled labor force

C.) the US winning the war and German scientists sharing their knowledge

D.) the US suffering no war damage & having a stong economy

URGENT!!!!!

Verified Answer :

"A.) the US winning the war & having a strong economy" is the best option from the list, since the war left a power vacuum that needed to be filled due to the practicaly fall of the British Empire (although the British were victorious in the war, it came at a price).