Explanation
- A
1 and 2
1 and 2. Chandraketugarh is in West Bengal, not Odisha.
- B
2 and 3
2 and 3. Inamgaon is a Maharashtra Chalcolithic site; Mangadu a Kerala megalithic site.
- C
3 and 4
3 and 4. Salihundam is a Buddhist site in Andhra, not rock-cut cave shrines as paired here.
- D
1 and 4
1 and 4. Both of those rows are mismatches.
Summary. Official key is (b) 2 and 3. Inamgaon (Maharashtra) is a well-known Chalcolithic settlement. Mangadu (Kerala) is a megalithic site. Chandraketugarh is a trading settlement in West Bengal, not Odisha. Salihundam is a Buddhist complex in Srikakulam, not correctly described as rock-cut cave shrines in this table. So only rows 2 and 3 match.