One of the Reasons for the Failure of the Negotiations

One of the reasons for the failure of the negotiations between the U.S.S.R. and Britain to form an anti-German alliance was that:

A) the Soviets feared they were being maneuvered into bearing the brunt of a Nazi attack.
B) the French were hostile to the Soviets and pressured the British into refusing the alliance.
C) Britain was unwilling to allow Soviet armies within its borders.
D) Britain signed a treaty of nonaggression and friendship with Nazi Germany.