Which of the Following Is True Regarding the Ability of Persons

Which of the following is true regarding the ability of persons suffering from a mental illness to enter into a binding contract?

A) Persons suffering from a mental illness never have capacity to enter into a binding contract.
B) Persons suffering from a mental illness have full capacity to enter into a binding contract,so long as they do not present a danger to themselves or others.
C) Persons suffering from a mental illness have full capacity to enter into a binding contract,so long as they inform the other party that they are either in,or in the process of seeking,professional treatment.
D) Persons suffering from a mental illness may have full,limited,or no legal capacity to enter into a binding contract,depending on the nature and extent of their mental deficiency.
E) Persons who suffer from a mental illness always have full capacity to enter into a binding contract.