Answer:
D) discharge by impossibility.
Step-by-step explanation:
Discharge by impossibility of performance is a situation which arises in a contract when a person is not able to perform duties due to illness, death or some other reasons which are created by the counter party.
In the given scenario Lionel Richmond is discharge by impossibility of performance because due to his accident he had an injury in the right leg which leads to amputation of his leg. He is now unable to perform his duties mentioned in the contract with the Christshire United soccer team.