'Kabaddi' is related to 'Bangladesh' in the same way 'Volleyball' is related to '____________'.

'Kabaddi' is the national sport of Bangladesh.

Similarly, Volleyball is the national sport of Nepal.

Option (a): Nepal – Volleyball

Option (a): Cuba – Base ball

Option (a): Japan – Sumo Wrestling

Option (a): Colombia – Tejo

Thus, the correct option is (a) Nepal.