Before this case, Indian courts largely tied natural justice to bodies performing quasi-judicial functions, so the question is really asking which judgment broke that boundary.
The specific expansion of natural justice beyond quasi-judicial functions is a doctrine most closely tied to one particular Indian Supreme Court ruling.
\[ \boxed{\text{A.K. Kraipak v. Union of India AIR 1970 SC 150}} \]Since three of these four cases are foreign precedents and one is Indian, it is worth checking whether the quoted principle, phrased in the language typically used by Indian courts, points to the Indian case among them.
The wording and doctrinal content of the quote track the Indian Supreme Court's reasoning in this particular case.
Hence, the correct answer is A.K. Kraipak v. Union of India AIR 1970 SC 150.