What was an effect of the United States' entry into World War I?

Britain shifted most of its troops to the eastern front because they were no longer needed in France.
Tensions developed between American and French troops over who would occupy the best trenches.
The arrival of fresh troops to the Allied side forced Germany to agree to a cease-fire within a year.**
The Ottoman Empire immediately surrendered to the Allied powers, realizing that its fight was futile.

Is it C?

It is the best answer, I agree.

Is it c?

ya i think so

Yes, your answer is correct. The entry of the United States into World War I had a significant effect on the outcome of the war. One of the effects was that the arrival of fresh troops to the Allied side, including soldiers from the United States, put additional pressure on Germany. This, along with other factors, eventually led Germany to agree to a cease-fire within a year, which marked the end of the war.