A driver observes every rule and still injures a pedestrian; a manufacturer's flawless product injures a user through an undetectable defect. Why does liability treat these differently?

C. Because strict liability attaches to creating a risk, not to fault

Strict liability asks who should bear an unavoidable risk rather than who misbehaved, and the answer is whoever created it, profits from it and can price it into the product. Fault-based rules deter carelessness; strict rules allocate residual risk, and they are different jobs.