Respuesta :
Answer:
B. After he went to the doctor to get his prescription, Charlie also needed to visit his sister who was in town.
Explanation: The clause After he went to the doctor to get his prescription is a dependent clause. It has a subject, he, and a verb, went, but it begins with a subordinating conjunction, after. The two should clauses be joined, and since the sentence starts with a dependent clause, it needs a comma before it's joined to the independent clause: "Charlie also needed to visit his sister who was in town."
