<p>Let's analyze the sentence:<br></p><p><strong>The board of directors will be holding an important meeting regarding the merger agreement to decide ( ____ what needs to be revised) before it is signed.</strong><br></p><p>The part wrapped with "()" is a noun clause.</p><p>This sentence is a complex sentence with the main clause and the adverb clause. The main clause is <span>“The board of directors will be holding an important meeting regarding the merger agreement tomorrow to decide something”. The adverb clause is “before it is signed.”</span></p><p dir="ltr"><span><span>Let’s look at the noun clause “________ needs to be revised.” </span></span></p><p dir="ltr"><span><span>The blank should serve as the subject of the noun clause since it’s directly followed by the verb “needs.” Choice (C) </span><span>is the correct answer since the word “what” can be used as the subject of a noun clause. </span></span></p>