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Two planets revolve round the sun with f...

Two planets revolve round the sun with frequencies `n_1` and `n_2` revolutions per year. If their average orbital radii be `R_1` and `R_2` respectively, then `R1//R2` is equal to

A

`(n_1/n_2)^(3/2)`

B

`(n_2/n_1)^(3/2)`

C

`(n_1/n_2)^(2/3)`

D

`(n_2/n_1)^(2/3)`

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