Why was it difficult for congress to fulfill its duties

Any congressional action required executive approval. Most congressional decisions required the approval of at least nine states. Congress lacked the power to regulate foreign trade.

Explanation:

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

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