This question is really asking you to match four bodies to their actual role in India's anti-corruption and grievance-redressal history, and pick the one that specifically proposed an Ombudsman-style office.
Only one body here is specifically remembered for originating the Ombudsman-style proposal, and it is the earliest of the four in terms of when the underlying recommendation was made.
So the correct answer is Administrative Reforms Commission, 1966.
A quick way to separate these four options is to recall the one achievement each is most associated with in Indian administrative history, since each name maps to a distinct legacy.
Matching each option to its own historical legacy, rather than its general subject area, again singles out the 1966 Administrative Reforms Commission as the body that first put forward the Ombudsman-style proposal.
So the correct answer is Administrative Reforms Commission, 1966.