Answer: "The man in the house seemed to be asleep." And "I was informed that the bus would arrive in 45 minutes."
Well, according to Plato, There is more than one answer. I agree that it's
The man in the house seemed to be asleep. But, the instructions specifically say "In which two sentences do the underlined words represent prepositional phrases?" The second is I was informed that the bus would arrive in 45 minutes.
Explanation: according to k12,
A preposition draws a relationship between a noun or pronoun and another word in a sentence. ... Common prepositional phrase examples include about, after, at, before, behind, by, during, for, from, in, of, over, past, to, under, up, and with.