Correct answer choice is :
D) McCarthy's accusations regarding communist infiltration of the government were discredited.
Step-by-step explanation:
The Army–McCarthy hearings were a set of conferences held by the United States Senate's Subcommittee on Inquiries to review opposing charges between the United States Army and U.S. Senator Joseph McCarthy.During the McCarthy era, numbers of Americans were involved of being socialists or communist consolers and became the subject of intrusive inquiries and interrogation before government or private industry councils, committees and agencies.