Ken, an unmarried seventeen$-$year$-$old, signs a contract to sell his car to the Regal Used Car Co$.$ Ken receives a better offer the next day from another car dealership and accepts the new offer. Ken is:

Group of answer choices

none of these

liable on the contract with Regal and must sell it his car

not liable to Regal and does not have to sell them his car

liable on the contract with Regal and must sell it a car of comparable value