I would say answer B because you should never only have one type of evidence, you should always have more than one source
The correct answer is C. To support his thesis
Explanation:
In an essay, the main purpose of the author is to explain and prove the main thesis that expresses the author's position or opinion towards an issue. Due to this, all arguments, explanations and therefore, all evidence included should support the thesis statement. Additionally, it is recommended the evidence used belongs to reliable sources and in this way offer strong reasons for the reader to belive the author's position. Thus, before writing his essay, Robert needs to make sure that he has evidence to support his thesis.
