Answer:.B. Hal and Sophia would win, since Jack already had a prior existing legal duty to not compete with them.
Explanation:
What is legal duty ?
It is a legally binding or contract obligation to act according to the law towards the other parties.
Jack, Hal, and Sophia entered into an agreement in regards to the sale of the restaurant. The contract included the non-competition agreement hence Jack is obligated to abide by this contract as agreed. He can not now decide to violate it at his own benefits because he is expected by the law to abide by this contract.