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Answer is **C**

Easiest way is to go with the options.

Set of numbers 12, 18, 21 and 28,

→ as 18 is there, we have to identify the options which are divisible by 9. For that, sum of the digits of the options given should be divisible by 9

→ Second criteria, as 21 and 28 are there, required number should be divisible by 7. Only option C is divisible by 7

The option which satisfies both the conditions is **9828**