Question

Identify the sentence in which the underlined clause is a noun clause that functions as the subject of the sentence.

Answer 1

The answer to this question is:

"Identify the sentence in which the underlined clause is a noun clause that functions as the subject of the sentence."

A-"Whatever movie is playing is acceptable to us!"

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Answer 2

The sentence in which the underlined clause is a noun clause that functions as the subject of the sentence is A, "whatever movie is playing is acceptable to us!".

First of all, the verb "to play", in its intransitive form only selects one complement, the NP "whatever movie".  However, the main verb of the sentence is the copular verb "to be" which selects an AdjP (adjetival phrase) as its complement to tell something about the subject of the sentence (whatever movie is playing).