The most accurate answer is: Reagan's assertive stance may have influenced Gorbachev to meet halfway.
This option reflects how Reagan's "peace through strength" policy, which involved building up military capabilities and taking a firm stance against the Soviet Union, created an environment where Gorbachev felt pressure to reform the Soviet system. Reagan's willingness to engage in dialogue and his strategic approach may have encouraging Gorbachev's initiatives for reform, ultimately contributing to the de-escalation of tensions and the resolution of the Cold War.