Why Has the Contributory Negligence Defense Been Replaced with a Comparative

Why has the contributory negligence defense been replaced with a comparative negligence theory in most states?

A) In order to assist a defendant in defending against unfounded claims.
B) In order to assist a plaintiff in avoiding the assumption of the risk doctrine.
C) In order to assist a defendant in avoiding the assumption of the risk doctrine.
D) Because of situations in which a plaintiff is barred from recovery due to minimal contributory negligence.
E) Because of situations in which a defendant is released from liability based on the last clear chance doctrine when equity requires that the defendant bear at least some responsibility.