Amy is a paying passenger on a bus operated by Acme Bus Company (Acme hereinafter). The bus collides with a car driven by Chris, due to the negligence of both the bus driver and Chris. Assume that moments after this collision, the bus is struck again because of Denny's negligent driving. Within hours, Amy is paralyzed but it is impossible to tell whether the paralysis is caused by the first or second impact, or was the result of the combined impacts.

A. Can Amy recover from a negligence claim against Acme? Why? Why not?

B. Can Amy recover from a negligence claim against Chris? Why? Why not?

C. Can Amy recover from a negligence claim against Denny? Why? Why not?