Under the contract law doctrine of supervening impossibility, a contract is discharged if an unforeseen event, occurring post-contract formation, renders performance impossible without fault of either party. Personal illness of a party obligated to perform personally is a valid reason for discharge.
Option (A) is incorrect as Raj's failure to perform was neither willful nor negligent.
Option (B) is correct because Raj's illness made performance legally and physically impossible.
Option (C) is incorrect; actual impossibility, not mere willingness, discharges a contract.
Option (D) is incorrect as specific health conditions can legally terminate a personal service contract.