During the Cold War, There Was

During the Cold War, there was

A) a continuous diplomatic exchange between U.S. and Soviet military advisors.
B) never any direct military conflict between the United States and the Soviet Union.
C) an occasional exchange of artillery fire across the East German/West German border.
D) direct fighting between U.S. and Soviet ground troops during the Korean War.
E) occasional dogfights between U.S. and Soviet fighter planes over Europe.