Only option 2 is correct as it contains the promise from the two parties and the essentials elements of a valid contract, which is legally enforceable.
Option 1 is incorrect as it contains the contract involving personal service and such contracts are not enforceable.
Option 3 is a promise and as such it is not a contract.
Option 4 is not correct as the contracts made by guardians on behalf of minors are not enforceable.