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Explanation:

Let there be x labour experts. Then, the number of health, population and refugee relocation experts will be 2x each.

Hence, x + 2x + 2x + 2x = 7x = 21

∴ x = 3

That is, the number of Labour, Health, Population and Refugee Relocation experts are 3, 6, 6 and 6 respectively.

Let Australasia have (y + 1) experts. Then the Americas have 2y experts and Africa and Europe have y experts each.

∴ y + 1 + 2y + y + y = 21

∴ y = 4

That is, Australasia, Americas, Africa and Europe have 5, 8, 4 and 4 experts respectively.

As Australasia has sent at least 2 experts on population studies, it has sent 1 expert each for the other three fields.

∴ The Americas and Europe have sent 1 expert each on labour.

∴ Europe has sent 1 expert each on Health, Population Studies and Refugee Relocation.

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Number of experts in Refugee Relocation from Africa cannot be found.

Hence, option (d).

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