If |(x^2+x,x+1,x-2),(2x^2+3x-1,3x,3x-3)...

If `|(x^2+x,x+1,x-2),(2x^2+3x-1,3x,3x-3),(x^2+2x+3,2x-1,2x-1)|=ax-12` then 'a' is equal to (1) 12 (2) 24 (3) -12 (4) -24

A

12

B

24

C

`-12`

D

`-24`

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The correct Answer is:

B

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