Which of the following is the most accurate statement about United States' involvement in World War I?

A.
The United States fought from the beginning of the war to the end, suffering only light casualties.

B.
The United States fought from the beginning of the war to the end, suffering heavy casualties.

C.
The United States sent supplies to Europe, but never soldiers.

D.
The United States stayed out of the war for more than two and a half years.