The argument of Reagan is most likely found in the following sentence:
<span>the Soviets challenged the Western alliance with a grave new threat, (this statement sounds most like an argument and least like a fact).
He supports this argument by mentioning things such as </span> <span>SS-20 nuclear missiles - so we see that he supports the claim with a fact. However, he also mentions personal impressions, such as during his visits. Therefore, the best answer is the following:
</span> <span>C) Reagan’s evidence is relevant but is insufficient to prove his claims as it relies on his own personal beliefs.</span>