Etta, who is obese, files a product liability suit against Fast Meal Corporation, alleging that the company's food products are unhealthy because, as Etta knows, the products contain high levels of cholesterol and saturated fat. Fast Meal can most successfully assert the defense of

a$)$ comparative negligence.

b$)$ preemption.

c$)$ assumption of risk.

d$)$ knowledgeable user.