Nina, a $17$ year$-$old, signs a contract to sell her car to OK Used Cars. Nina receives a better offer the next day from Perfect Pre$-$owned Cars, Inc., and accepts the new offer. Nina is

liable to OK and must sell it a car of comparable value.

liable to OK and must sell it her car.

not liable to OK because she is a minor.

not liable to OK because her acceptance of Perfect's offer dissafirm's the deal with OK$.$