Why Did the Results of Churchill's Meeting with Stalin in October

Why did the results of Churchill's meeting with Stalin in October 1944 on the postwar distribution of territories disturb Roosevelt?

A) He felt that U.S. interests in Europe were being ignored.
B) Their agreements violated the U.S. government's promotion of collective security, self-determination, and free trade.
C) He did not trust Stalin and did not believe that Western powers could negotiate with him in good faith.
D) Churchill had at least tacitly agreed to allow the Soviets free reign to expand their influence over Korea, Manchuria, and the Sakhalin and Kurile Islands.