Answer: They texted their friends, wondering why they were late
Explanation: a prepositional phrase includes words such as: about, after, at, before, behind, by, during, for, from, in, of, over, past, to, under, up, and with.
This is something I need YOU need to do. Hint: find something about the topic that draws yo. Make it your own. If you don't love it, it will be boring. Don't put it off. if you do, you're selling yourself short.