depends on who those people are on the tracks.

Maybe they are blow up dolls just trying to psyche you.

I choose this providing the bodies won't derail the trolley. Otherwise, A would be the safer bet. Remember: Safety first.

Those people are shown lashed to the tracks so I'd take that to mean they were part of a repair job and we're supposed to roll on. It would be different if it were something like a cow standing on the tracks because then you'd wonder if it's really supposed to be there or not.