Answer:
Prepositions must always be followed by a noun or pronoun. That noun is called the object of the preposition. Note that a verb can't be the object of a preposition.
First off, a compound sentence is a sentence that contains at least two independent clauses. That tells us <em><u>C</u></em> is out almost immediately because it has a dependent clause, "After Maria finished dinner". Next, is <em><u>B</u></em>, That's a simple sentence, there's no joining method or comma and it only has one subject and one predicate. D isn't right either, it just about the same as <u><em>B</em></u><em />. Your answer would be <em><u>A. Paolo missed his girlfriend, but he knew she'd be back soon.</u></em><u /><u /> This sentence has a joining clause, and two <em>independent </em>subjects.
Hope this helps,
♥<em>A.W.E.<u>S.W.A.N.</u></em>♥
You process it in your mind, obtaining the information you have been told.