What was America’s first major contribution to the Allies after Congre

What was America’s first major contribution to the Allies after Congress declared war in 1917?

A) agreeing to allow Allied generals to use American troops as replacement forces in British and French military units
B) sending a large American Expeditionary Force (AEF) of infantry troops to the Western Front
C) agreeing to allow the Allies to borrow the money to buy war materials from the United States
D) using a naval convoy system to protect merchant ships travelling from the United States to Great Britain

ANSWER
D