Emerson's purpose in using short sentences is "to speak truly to his audience, without embellished language or lengthy syntax," as stated in option A.
The length of the sentences written by an author can reflect a number of things:
Here, we are told that Emerson usually employs longer sentences. Why, then, would he use short sentences with little to no internal punctuation in this passage? Because his purpose is to be straightforward. To do so, he chooses language that is not embellished.
When we read the passage out loud, for example, we can see how direct those short sentences are. It is as if someone is expressing their opinion is a very candid manner.
With the information above in mind, we can conclude that option A is the correct answer for this question.
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