Maybe.. approving? (Not 100% sure on that)
The answer is definitely D, because it contains two independent clauses that are joined together without a comma or conjunction. (An independent clause just means a chunk of language that has both a subject and a verb and could be a complete sentence on its own.)
Gregor has become a horrible vermin more specifically a giant bug or insect.
Answer:
The action slows when Annie and Anagnos have a discussion, and the play becomes boring.
Explanation:
This is not someting that they should include in a summary. Instead it should be replaced by what Annie and Anagnos are talking about for an effective summary.
Hope this helps!