What does the context suggest is the most likely meaning of manifest in this sentence from "The Pedestrian"?

Mohammed reads this sentence. we knew the runner was an amateur because experts can run much faster. based on the contrast clue, what prediction does mohammed most likely make about the meaning of amateur? it means "someone who likes running." it means "someone who dislikes running." it means "someone who has a lot of experience." it means "someone who has very little experience."