What is the test for causation in fact (but-for causation)?

What is the test for causation in fact (but-for causation)?

• A. Causation in fact requires that but-for the defendant’s conduct, the plaintiff would not have suffered the injury; multiple causes may require alternative methods to establish causation.
• B. Causation in fact is determined solely by foreseeability.
• C. Causation in fact requires proof of proximate cause.
• D. Causation in fact is established by the existence of an injury alone.

Answer: (A)