The charges were completely without merit is the Senate committee that investigated Joseph McCarthy's original claim of communists in the government.
McCarthy was the Republican senator who asserted vehemently that communist spies were working for the U.S. Federal Government. Due to a lack of proof, it was not, however, proven in court.
He then came under scrutiny and restrictions from the Congress party, which caused him to lose influence within the party.
Thus, option B is correct.
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