Final answer:
A contract involving a minor and an adult is typically voidable at the option of the minor, due to the minor's legal incapacity. The law protects minors from being bound by contracts as they are not deemed fully able to understand the agreements they enter into.
Step-by-step explanation:
When examining the legalities surrounding contracts, it is important to understand how the age of the parties involved can affect the agreement. A contract signed between an adult and a minor is generally considered to be D. voidable by the minor because the minor is not considered to be legally competent to enter into contracts. Parents or guardians can consent on behalf of their children, which is necessary because children themselves are not legally capable of providing this consent.
In most jurisdictions, including the United States, a person is considered an adult at the age of 18 for certain responsibilities and rights, such as military enlistment. However, they remain a minor in other contexts, such as purchasing alcohol, until they reach 21. The law typically allows minors to disaffirm contracts they have entered into because they are not seen as being mature enough to understand and weigh the consequences fully. This is a protective measure, aimed at preventing exploitation of the young.