How many countries had participated in conducting international naval exercise ‘Aman-17’ in the Arabian Sea off the coast of Karachi on 10 to 14 February-2017?

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How many countries had participated in conducting international naval exercise ‘Aman-17’ in the Arabian Sea off the coast of Karachi on 10 to 14 February-2017?

A. 21
B. 38
C. 27
D. 17