The Law Makes Individuals Suffering from Mental Illness Lack Capacity

The law makes individuals suffering from mental illness lack capacity to enter into contracts because:

A) The mental ill tend not to vote in large numbers
B) Those with mental illness would be at a disadvantage in their ability to protect their own interest in bargaining
C) An individual cannot be on public assistance and be legally competent to enter into a contract
D) There is fear that those with mental illness would manipulate and harm those that they would enter into contracts with