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The answer is B. Correct as is.

Explanation:

When a conjunctive adverb links two independent clauses, a semicolon should be used to correctly punctuate a sentence. Some common conjunctive adverbs include moreover, nevertheless, however, otherwise, therefore, then, finally, likewise, and consequently.  

Is the custom in the U.S. Senate of refusing to confirm a presidential appointment to office opposed by both senators from the state of the appointee or by the senator of the Presidents party.