This is most evidently a metaphor. The thing to keep in mind when analyzing literature/poetry is that if you see figurative language making comparisons/drawing parallels between two differing things--instances where the meaning is not literal such as how injustice is not really a fire and has no flames--it's a safe bet you'll have on your hands a metaphor.
Answer:
He was with the group of friends in the park.
Explanation:
This sentence is the only one that incorporates that phrase and also includes a subject and a verb.
