Walking in Don’s air-conditioned market on a hot day with her sisters, four-year-old Silvia drops her ice cream on the floor near the dairy case. Two hours later, Jan stops to buy milk, slips on the ice cream puddle, and breaks her arm. Don is

a. liable, because a merchant is always liable for customers’ actions.

b. liable, if Don failed to take all reasonable precautions against Jan’s injury.

c. not liable, because Jan’s injury was her own fault.

d. not liable, because Jan’s injury was Silvia’s fault.