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Let S = 2 + 6/7 + 12/7^2 + 20/7^3 + 30/7^4 + ..... then 4S is equal to

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Let S = 2 + 6/7 + 12/72 + 20/73 + 30/74 + ..... then 4S is equal to 

(A) (7/3)2

(B) 73/32

(C) (7/3)3

(D) 72/33

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Correct option is (C) (7/3)3

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