The correct answer is option (b) - (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i).

Here is the breakdown of each option:

- Option 1: Hunter’s Commission - The correct year for this commission is not provided, so it does not match any of the given years.

- Option 2: Wardha Scheme - The correct year for this scheme is not provided, so it does not match any of the given years.

- Option 3: University’s Act - The correct year for this act is not provided, so it does not match any of the given years.

- Option 4: Radhakrishnan Commission - The correct answer is option (b) as it matches the given year "1948".

All other options do not match the given years, so they are not correct.