Question

The development of an atomic bomb by the Soviets in 1949 did all of the following except,...

led to the authorization of the development of a hydrogen bomb in the U.S.

pave the way for a nuclear arms race between the U.S. and Soviet Union.

increased psychological tensions in the U.S. and Soviet Union.

led to a treaty that limited the number of nuclear weapons in the U.S. and Soviet Union.