Manny cautiously approached the injured animal and slowly reached out to pet its back. He spoke to it in a gentle voice, wondering whether he could get it to Dr. Vito, the local vet, without causing more damage -- and without getting bitten. Then he wondered whether his mother could help. What signals that the story is written using third-person narration?

the presence of three characters
the narrator's referring to Manny as "he"
the lack of dialogue between characters
the narrator's describing Manny's concern