Answer:
c. the capacity to enter into a valid contract and the right to avoid liability under it.
Step-by-step explanation:
In plain simple words, a minor can enter into a valid contract and can also void it at will. E.g. if a minor buys a car and then crashes it, he/she may return it and the seller must return the money. Some states impose a duty of restitution to minors (meaning that they have to return goods in the same condition), but others do not.
That is why you generally shouldn't engage in contracts with minors unless their parents agree with it, and also sign the contract.