Damba is injured in an accident involving a defective tractor. Damba sues the maker of the tractor. To successfully claim assumption of risk as a defense, the defendant must show

a. that Damba voluntarily engaged in the risk while realizing the potential danger.

b. that Damba knew and appreciated the risk created by the defect.

c. that Damba’s decision to undertake the known risk was unreasonable.

d. all of the above.