Answer:
.b.can agree to a new contract that includes the new price
Explanation:
When Sal and Tasty agreed to cancel their first contract, that was the end of that particular contract. No further negotiations can take place because the contract doe not exist. By calling Tasty the following day, Sal was initiating a new contract.
A new contract does not need to make any references to the canceled contract. Sal and Tasty are free to negotiate for new terms and negotiations since this is a new contract. The details of the canceled contract are no longer binding to them.