In the Tort of Negligence, the 'Eggshell Skull' Rule Is

In the tort of negligence, the 'eggshell skull' rule is the rule that:

A) The defendant is liable for the full extent of the harm suffered by the plaintiff even if the plaintiff suffers greater harm than they otherwise would have due to a pre-existing vulnerable condition.
B) The defendant is not liable for the full extent of the harm suffered by the plaintiff if the plaintiff suffers greater harm than they otherwise would have due to a pre-existing vulnerable condition.
C) The defendant's liability for the harm suffered by the plaintiff is apportioned between the plaintiff and defendant according to the extent the plaintiff's pre-existing vulnerable condition resulted in greater harm than they otherwise would have suffered.
D) The defendant is not liable for the harm caused to the plaintiff because of a pre-existing vulnerable condition.