in the fourth paragraph, the author includes a quotation by Einstein primarily to
According to the complete question, we can see that the author adds a quote from Albert Einstein to act as a supporting evidence in order to back up his claim.
As a result of this, we can see that the reason for making use of the quote is to show the audience that he is credible because he is backed up by an authority figure in the person of a respected scientist like Albert Einstein.
Therefore, the correct answer is option A
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