Real Chocolate Company (real)makes a box of candy, which it sells to Sweet Things, Inc (Sweet), a distributor. Sweet sells the box of candy to Tasty Candy store (tasty), where jill buy it. bill gives the candy to ken, who breaks a tooth on a stone that was in the box and the same size and color as a piece of the candy. If real, sweet, tasty we're not negligent, under what legal doctrine can they be held liable for ken's injury. Why or why not