Answer:
B. While Monica addressed the letters, Brent stamped and sealed them, and they both took the letters to the post office to be mailed.
Explanation:
A compound-complex sentence contains at least two independent clauses (compound) and one or more dependent clauses (complex).
- While Monica addressed the letters (dependent clause),
- Brent stamped and sealed them (independent clause),
- they both took the letters to the post office to be mailed (independent clause).
This sentence contains multiple independent clauses (Brent stamped and sealed them, and they both took the letters to the post office to be mailed) connected by coordinating conjunctions (and) and a dependent clause (While Monica addressed the letters).
Therefore, option B is the compound-complex sentence.
