Bill, at the age of 19, is adjudicated to be mentally incompetent by a court. The court assigns Scott as Bill's guardian. If Bill then enters into a contract with Tom, this contract would be:

A) enforceable, as long as Bill was lucid at the time of making the contract
B) enforceable because Bill is over the age of 18 and therefore has legal capacity
C) voidable, if Bill lacked the ability to understand the nature and obligations of the contract
D) void, because only Tom would have the ability to enter Bill into a binding contract