I don't understand this ACT English question..

International Students
1

<p>Similar forms
of demonstrations, known as “walkless-talkless
parades,” had been adopted by national woman
suffrage organizations in Washington, D.C</p>

<p>A. NO CHANGE
B. have been
C. having been
D. OMIT the underlined portion.</p>

<p>-The underlined portion is ‘had been.’-</p>

<p>I don’t understand why it’s A. I picked B. It says it doesn’t match with the tense of the sentence, but how? I plugged in B and read the sentence and it still sounded right to me.</p>

2

<p>Have been is plural. You can’t use plural in this case because the subject is singular. You might say “but walkless-talkless parades is plural”. Actually, its not. Its just there to trick you. </p>

<p>“Similar forms
of demonstrations, known as “walkless-talkless
parades,”</p>

<p>after the word known one specific name is mentioned not two.</p>