To How Many Cases Should You Refer When Writing a 2,000-Word

To how many cases should you refer when writing a 2,000-word essay?

A) A good rule of thumb is one case reference per hundred words, so approximately twenty cases.
B) As many cases as possible, in order that your answer is well supported and that your lecturer can see that you have done a lot of research.
C) No more than ten for a 2,000-word essay. More references than that will interrupt the flow of your writing and detract from your argument.
D) As many as you need to ensure that the points raised in your answer are supported with authority.