1) D

Population of Republic of Bondia = Total population of six islands
Total population of six islands = 8,628,709
10% of 8,628,709 = 862,870
Islands which have less than 10% of population of Bondia = Brosnan and Dalton

Out of Brosnan and Dalton, we need to know which island’s area is more than 20% of the area of Bondia.
Total area of Bondia = 26315
20% of 26315 = (10% of 26315) x 2 = 2631.5 x 2 ≈ 5200 km^2
Island with area more than 5200 = Dalton
Brosnan has an area of 5079 which is less than 5200 so that cannot be the answer.

Answer = Dalton

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