Correct Answer: Option D

Explanation

0.000215215 x 0.000028

= 215 x 10^-4 x 28 x 10^-4

= 215 x 28 x 10^-6-6

= 6020 x 10^-12

= 6.020 x 10³ x 10^-12

= 6.02 x 10^{3 - 12}

= 6.02 x 10^-9

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