Part A: We can actually deduce here that the best that describes how the Bostonians felt about the birth of the new nation is: A) exuberant and celebratory.
Part B: The sentence from the text that gives the clearest additional evidence for the answer to Part A is: D) There were three cheers that "rended the air." and they were followed by an elated ringing of bells; the cannons roared, and rifles' shots rang in the air.
Evidence actually refers to the available facts, figures, statistics and data that are needed to validate or clarify an argument. Evidence gives one the opportunity to know whether an argument is true or not.
We see here that from the given statement, it is very clear that the Bostonian's reaction was celebratory and exuberant.
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