The correct answer is D, Reagan presents relevant and sufficient evidence from real-world examples. Reagan mentions known facts: namely, the deployment by the Soviets of "hundreds of new and more deadly SS-20 nuclear missiles", which put every capital city in Europe at risk. NATO (the Western Alliance) threatened with a counter-deployment (that is, deploying missiles of its own) unless the Soviets agree to eliminate such weapons on both sides. All this was public knowledge, and is both relevante and sufficient as evidence.
