Final answer:
An employee's duty to mitigate applies under Contract Law, requiring a wronged party to reduce the financial harm caused by a breach. This duty is relevant in the context of employment contracts for dismissed employees.
Step-by-step explanation:
A dismissed employee's duty to mitigate damages applies under A) Contract Law. This principle requires the wronged party in a contract, which includes employment contracts, to take reasonable action to minimize the financial harm caused by the other party's breach. In the context of an employment contract, this means that if an employee is unlawfully dismissed, they are expected to seek new employment or take comparable steps to reduce their financial losses. This duty to mitigate is not directly relevant under Labor Law, Tort Law, or Criminal Law, where the legal considerations and obligations differ.