We can actually deduce here that the sentence that best explains the credibility of the claim made in the excerpt is: C. The claim is credible because it mostly contains facts about what was going on at the time.
Claim actually refers to the statement that one makes in order to prove a point. We see that for a claim to be valid, evidence is needed to validate it.
We see here that the speaker shows credibility by giving facts about the war which was exactly what was happening at that time.
Thus, we see here that the above selected sentence actually helps us to explain the credibility of the claim made in the excerpt.
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