Which of the following is TRUE in respect of the law of negligence? Select one: a. If a person's failure to meet the appropriate standard of care does not actually cause anyone damage, then the person is not liable, as no duty of care would have been owed. b. To be negligent, a defendant must have breached a duty to be careful, by failing to meet the appropriate standard of care. As long as a person does what the average person would have done in similar circumstances, she will not be liable. c. A defendant who has been negligent may not have to compensate the plaintiff for the full amount of the plaintiff's injuries, if the plaintiff did something to contribute to those injuries. d. A lower standard of care is demanded for dangerous activites, because people who engage in dangerous activites voluntarily assume the associated risks