Which sentence uses a coordinating conjunction to join prepositional phrases? Select the best answer. Gideon dropped his dog off at his friend's house yesterday. A few hours later, the dog squeezed out of his crate and through an open window. Luckily, Gideon hadn't left for vacation yet and found the dog sniffing around in his backyard. Gideon started thinking that he might need someone to stay at the house with the dog while he is away and unavailable.