What is the best statement of the 2nd Red Scare of Conformity?

The correct answer to this open question is the following.

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A statement that could describe the Second Red Scare and McCarthyism is "a time in US history when Senator McCarthy used of accusations, blacklisting, and investigations against suspected communists."

We are referring to Wisconsin Republican Senator Joseph McCarthy who in those Cold War years accused that many members of the US federal government and the US military were supporting Communist activities in the mid-1950s. McCarthy just accused people but never offer a serious argument or proof, so he ended up being a liar and his political career ended.

what are the choices?