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If the lines vecr = -hati + hatj - hatk ...

If the lines `vecr = -hati + hatj - hatk + lambda(2hati + hatj + 3hatk)` and `vecr = -2hati + alpha hatj + hatk + mu(2hati + 3hatj + 4hatk)`, are `(lambda, mu in R)` coplanar, then the value of `alpha`, is:

A

`-9//2`

B

`11//2`

C

`-11//2`

D

`15//2`

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The correct Answer is:
D
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