Since the Cold War ended, U.S. policymakers' concern with nuclear weaponry has shifted to
a. the possibility of a computer error in the U.S. or former Soviet weapons systems that could mistakenly launch a nuclear missile.
b. the spread of nuclear technology to irresponsible regimes and terrorists.
c. the use of a tactical nuclear weapon in ethnic conflicts in eastern Europe.
d. the possibility that, in the process of dismantling the U.S. and former Soviet arsenals, a nuclear warhead could be accidentally detonated.
e. the spread of nuclear technology to NATO forces.
Answer: b