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If the coefficents of x^(3) and x^(4) ...

If the coefficents of `x^(3) ` and `x^(4)` in the expansion of `(1+ax + bx^(2)) (1-2x)^(18)` in powers of x and both zero then `(a,b) ` is equal to

A

`(14, (251)/( 3))`

B

`(14, (272)/(3))`

C

`(16,(272)/(3))`

D

`(16,(251)/(3))`

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The correct Answer is:
C
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