By the fourteenth century B. C.E., international relations were marked by: a. suspicions and hostility; states wanted as little contact as possible.
b. feelings of brotherhood between the Hittites and the Assyrians.
c. continual warfare between the regional powers.
d. strictly limited trade in essential goods only: grain, oil, wine, and salt.
e. diplomatic standards, polite forms of address, gifts, and alliances.

hello!

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".

hope this

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