Explanation
- A
Only one pair
Only one pair. Two dynasty tags hold.
- B
Only two pairs
Only two pairs. Nannuka–Chandela and Nagabhata II–Gurjara-Pratihara. Jayashakti is Chandela, not Paramara; the famous Bhoja is Paramara, not Rashtrakuta.
- C
Only three pairs
Only three pairs. Two names are swapped across houses.
- D
All four pairs
All four. Two mismatches.
Summary. Official key is (b) only two pairs. Nannuka founded the Chandela line; Nagabhata II is Gurjara-Pratihara. Jayashakti is a Chandela, not Paramara. Raja Bhoja of Dhara is Paramara, not Rashtrakuta.