Rose, who is obese, files a product liability suit against Burger Meal Corporation $($BMC$),$ alleging that BMC$\text{'}$s food is unhealthy because, as Rose knows, it contains high levels of cholesterol and saturated fat. BMC can most successfully assert the defense of

a$.$ assumption of risk.

b$.$ preemption.

c$.$ knowledgeable user..

d$.$ comparative negligence.