Answer:
A. The principle of strict liability.
Step-by-step explanation:
The MacPherson v. Buick Motor Car case in 1916 changed the way product liability would be considered in the US. Strict product liability doctrine states that a manufacturer can be sued not only as a result of their negligent acts, but also for selling defective products. Before that case, privity of contract was required in order for someone to sue a manufacturer, this means that both parties had to engage in a contract. But this case resulted in consumers being able to sue manufacturers even if they did not engage in a contract directly with them. Actually, how many of us buy things directly from a manufacturer? We generally buy goods from retailers, and that is the reason why this case was so important.