A few years ago Bernice purchased some medication through her veterinarian for her aging pet iguana, Scales, who had a skin disease. Scales died a few months after beginning the medication. At the time of the death, Bernice thought that Scales had died of natural causes. She just read in the newspaper, however, that a number of reptilian type animals had been harmed by the drug Scales ingested. Bernice immediately talked to her veterinarian who told her that while she now believes the medication was harmful to Scales, it was manufactured by a number of different manufacturers, and there is no way to determine the exact manufacturer of the medication given to Scales. Which of the following is Bernice's best chance at recovery?

a. Market-share liability

b. Joint and several liability

c. Product-line theory

d. Continuity theory