According to the doctrine of supervening impossibility under contract law, if an unforeseen event occurs after the formation of a contract which makes the performance impossible through no fault of either party, then the contract is discharged. Illness of a person required to perform personally under the contract is a valid ground for discharge.
Option (A) is incorrect because Raj’s non-performance was not willful or negligent.
Option (B) is correct because Raj’s illness rendered the performance legally and physically impossible.
Option (C) is incorrect—mere willingness doesn't discharge a contract; actual impossibility does.
Option (D) is incorrect because certain health conditions can legally discharge a personal service contract.