Which of the Following Contracts Is Void

Which of the following contracts is void?

A) a contract with an insane person for a T.V., where the insane person, or his legal representative, can prove that he was insane at the time of the contract but cannot prove anything else about the incident
B) a contract with an insane person for necessaries such as food and shelter
C) a contract containing an exculpatory clause limiting the liability of one of the parties
D) any contract with a status Indian
E) a contract to sell a crop of marijuana growing in a particular field