The British separated the North-West Frontier Province (NWFP) from the Punjab Province in:

The British government separated the North-West Frontier Province (NWFP) from the Punjab Province in 1901. This administrative reorganization was primarily driven by strategic considerations, aiming to create a distinct frontier region for better management of tribal areas and defense against potential Russian expansion. Lord Curzon, the then Viceroy of India, was instrumental in this decision.

• B. 1901: This is the correct year when NWFP was established as a separate province.
• A. 1997: This year is far too late and irrelevant to British colonial administration.
• C. 1935: While significant constitutional changes occurred in 1935 (Government of India Act), the separation of NWFP happened much earlier.
• D. 1922: This year is also incorrect; the separation predates it.