"All of a sudden..." is a transition that shows suspense. It says something happened, but it didn't happen with any warning and it doesn't tell the reader up front what went on or if it was good or bad.
Response: C. I never saw a moor.
Explanation:
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<span>The sentence which does not contain any errors in comma usage is:
A. He can juggle several tennis balls, but he doesn't like tennis.
In this sentence, comma is used to denote a brief pause at the same time separates the dependent and independent clauses for emphasis.</span>
