I believe the answer is B
The choice that best describes the sentence and explains how to improve it is: This sentence is complete and correct. It does not need any revision. The sentence above is an example of a complex sentence; it contains both an independent clause and a dependent or subordinate clause. The subordinate clause is introduced by the subordinating conjunction "after". After the comma, the independent clause follows to complete the whole thought of the sentence.
I think it's B. questions
hope it helps
