Dirk is driving a sport utility vehicle in which Elin is a passenger when they are involved in a traffic accident, and Elin is injured. Liability may be imposed on Dirk for Elin's injury if Dirk's driving is
a. neither the causation in fact nor the proximate cause of the injury.
b. only the causation in fact of the injury.
c. only the proximate cause of the injury.
d. the causation in fact and the proximate cause of the injury.