Egbert, age sixteen, purchases a $500 video-game system and a $50 computer chair from CompuStore. Egbert changes his mind and wants to avoid the contract for the video-game system but not the computer chair. Egbert may:________.
a. may not disaffirm the contract because it is for necessaries.
b. disaffirm part of the contract for the video-game system.
c. disaffirm only the computer chair, because it is incidental to the contract.
d. only disaffirm the entire contract.