Which of the Following Best Describes the Narrow Ratio of Donoghue

Which of the following best describes the narrow ratio of Donoghue v Stevenson [1932] in relation to product liability?

A) Manufacturers can only be liable when their products are dangerous.
B) Manufacturers owe a duty of care to consumers to take care during the production of their products.
C) Manufacturers can only be liable to consumers if they have a contract with them.