Minors (persons under age 18) or persons who, by reason of mental illness or defect, are unable to understand the nature and consequences of the transactions create voidable contracts.
true / false.

True.

Explanation:

Mental illness may be defined as the medical condition that affects the mental state, thinking capability and affects the mood of an individual. Mental illness can occur in any age group.

The individuals that are under 18 or the persons that suffers from mental illness are not able to understand nature and consequences of the transaction that create voidable contracts.

Thus, the answer is true.

70 % i think is the answer.