Final answer:
Contracts between an infant (minor) and an adult are voidable at the option of the minor, but remain binding on the adult until the minor chooses to void it.
Step-by-step explanation:
A contract entered into between an infant and an adult is voidable by the infant but binding on the adult. In legal terms, "infant" typically refers to a minor which is someone under the age of majority in most jurisdictions (usually under 18 years old). Contracts entered into by an infant are considered voidable because the law recognizes that minors may lack the capacity to fully understand the implications of the agreements they make.
The option that correctly represents this scenario is: C - voidable by the infant but binding on the adult. The adult in the contract is expected to be fully capable of understanding the contract terms and is therefore bound by them unless the minor chooses to exercise their right to disaffirm the contract. If the minor (infant) decides to void the contract, they can do so, but it remains binding on the adult until such action is taken.