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Let veca=hati+2hatj+4hatk, vecb=hati+lam...

Let `veca=hati+2hatj+4hatk, vecb=hati+lambdahatj+4hatk` and `vecc=2hati+4hatj+(lambda^2-1)hatk` be coplanar vectors . Then the non-zero vector `veca xx vecc` is `-2lhati+5 hatj` . The value of l is ____.

A

`-10hati + 5hatj`

B

`-10hati - 5hatj`

C

`-14hati - 5hatj`

D

`-14hati + 5hatj`

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The correct Answer is:
A
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