Option B: a-ii, b-iii, c-iv, d-i
Sariska – Rajasthan (ii), Manas – Assam (iii), Periyar – Kerala (iv), Corbett – Uttarakhand (i).
The passage explicitly lists all four locations: "Corbett National Park in Uttarakhand… Sariska Wildlife Sanctuary in Rajasthan, Manas Tiger Reserve in Assam and Periyar Tiger Reserve in Kerala." Match each name to its state directly from this list. Option B is the only one that satisfies all four pairs correctly.