What prompted the change in ronald reagan's approach toward the soviet union during his second term? a change in soviet leadership backlash from the american public pressure from european allies congress's refusal to ratify treaties?

The best answer is  a change in soviet leadership.

At the end of Reagan’s second term was a surprising arms-reduction agreement with the Soviet government. Under Mikhail Gorbachev, who came to power in 1985, the Soviets pursued renewed détente so that they could focus their energies and financial resources on pressing domestic problems. The logjam that had impeded arms negotiations suddenly broke in 1987, when Gorbachev announced that he was willing to consider mutually reducing nuclear weaponry. After nine months of strenuous negotiations, Reagan and Gorbachev met amid much fanfare in Washington, D.C., on December 9, 1987, and signed a treaty to eliminate intermediate-range (300- to 3,000-mile) nuclear missiles. The treaty marked the first time that the two nations had agreed to destroy a whole class of weapons systems. Under the terms of the treaty, the United States would destroy 859 missiles, and the Soviets would eliminate 1,752. Still, the reductions represented only 4 percent of the total nuclear missile count on both sides.

true.

hope this !

the answer is b for brother