Which Best Describes Assumption of the Risk in a Negligence

Which best describes assumption of the risk in a negligence case?

A) The plaintiff knowingly and willingly subjected herself to a risk, and by doing so, is not able to collect from a defendant even if all of the elements of negligence are present.
B) The defendant gave advance warning to the plaintiff that an injury would occur.
C) The plaintiff is more at fault than the defendant in causing the accident.
D) The plaintiff was involved in an abnormally dangerous activity.
E) The defendant knew that the conduct was risky, but nonetheless chose to engage in it.