Why is Donoghue v Stevenson considered to be such an important case in the law of negligence:

Select one:

a. It established a general test, based on the "neighbour principle", for when a duty of care arises

b. It identified an exhaustive list of established categories, for when a duty of care arises such as a motorist owing a duty of care to other road users

c. It sets a precedent for providing a remedy for consumers who get sick when they drink ginger beer with a snail in it

d. All of the above