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Let f(x) be continuous in (-oo, oo) and...

Let f(x) be continuous in `(-oo, oo)` and f'(x) exists in `(-oo, oo)`. If `f(3)=-6` and `f'(x) ge 6` for all ` x in [3,6]` then -

A

`f(6) ge 24`

B

`f(6) ge 12`

C

`f(6) le 24`

D

`f(6) le 12`

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The correct Answer is:
B
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