Which Statement About the Role of Possible Atomic War in the 1950s

Which statement about the role of possible atomic war in the 1950s is NOT true?

A) New environmental and health problems emerged because of nuclear testing.
B) The United States-U.S.S.R. rivalry did not threaten the safety of western Europe.
C) Both the United States and the U.S.S.R. developed the enormously powerful hydrogen bomb.
D) The rivalry between the United States and the U.S.S.R. produced the beginning of a long arms race.