Answer: A contractual obligation om shipment is not enforceable.
Explanation: A contract is a legally binding agreement. For a contract to be legally binding it needs to have an offer and acceptance. Strike and Bailey are merchants who both agree on the stated quantity and price of shirts to be shipped. However, the declaration or condition of shipment is neither agreed nor accepted by both Strike and Bailey as Strike offered to deliver using 'Dependable Truck Line' while Bailey accepted delivery by 'Yellow Express Truck Line' that was never offered.
For a contract to exist, a complete offer and acceptance must exist on the full terms and conditions of te shipment in this case. However, there is no agreement by either party on the shipment therefore contractual obligation on shipment is not enforceable.