What Is the Significance of a "Defect" in a Products

What is the significance of a "defect" in a products liability case based on strict liability?

A) It is not necessary,but can be used to eliminate the need to prove that there was an injury.
B) It is a required element in the proof of such a case.
C) Its presence would allow punitive damages to be awarded.
D) Its presence would eliminate liability for the defendant.
E) The party who caused the defect is the only one who can be held liable.