Answer:
C). Primary sources can include the exact words that witnesses used to testify at a trial.
Step-by-step explanation:
The authors employ several distinct evidence to substantiate their argument and establish the credibility of their claim.
As per the question, option A best displays the evidence related to historical events that could support a claim as the historical events could only be validated logically through primary sources(first-hand accounts) like artifacts, diaries, literary texts, etc. that offer authentic and bona fide information without leaving scope for contradiction.
The other options are incorrect as option B is covered under the third option(option A) and the other two propose secondary sources or statistics(based on a sample) that often have a scope for adulterated information that may affect the credibility of the author and his claim. Thus, option C is the correct answer.