Which of the Following Statements Is TRUE with Respect to the Issue

Which of the following statements is TRUE with respect to the issue of factual causation in negligence?

A) The issue of factual causation is always decided on the basis of the but-for test.
B) Liability cannot be imposed if the defendant's carelessness was only a cause, and not the only cause, of the plaintiff's losses.
C) Liability cannot be imposed if the defendant's carelessness was only a cause, and not the most important cause, of the plaintiff's losses.
D) The issue of factual causation is decided on the basis of the reasonable person test.
E) The doctrine of joint and several liability applies if different defendants caused the plaintiff to suffer a single injury.