What Was the Consequence of Franklin D

What was the consequence of Franklin D. Roosevelt's agreement with Joseph Stalin at the Teheran Conference that the British-American armies would launch a frontal assault on France?

A) The United States would not be able to supply the Soviet Union with needed arms.
B) Great Britain would be able to protect its colonial holdings from Soviet influence.
C) British-American armies fighting in France would face the bulk of the German military.
D) Only Soviet troops would liberate eastern Europe.