The standard enthalpy of formation of NH₃ is – 46 kJ mol^–1. If the enthalpy of formation of H₂ from its atoms is – 436 kJ mol^–1 and that of N₂ is –712 kJ mol^–1, the average bond enthalpy of N—H bond in NH₃ is

(A) – 1102 kJ mol^–1

(B) – 964 kJ mol^–1

(C) + 352 kJ mol^–1

(D) + 1056 kJ mol^–1