Which of the Following Statements About the Availability of Rescission

Which of the following statements about the availability of rescission for voluntary dispositions is false?

A) Rescission can be available even where the person making a voluntary disposition made a mistake through carelessness.
B) Rescission is available for voluntary dispositions made as a result of a misprediction.
C) Rescission of a voluntary disposition for mistake will be possible only if the causative mistake is sufficiently grave as to make it unconscionable on the part of the donee to retain the property.
D) Rescission of a voluntary disposition can be available for a mistake about the law despite the maxim that 'ignorance of the law is no defence'.