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Let vecalpha, vecbeta, vecgamma be three...

Let `vecalpha, vecbeta, vecgamma` be three non-zero vectors which are pairwise non-collinear. If `vecalpha+3vecbeta` is collinear with `vecgamma and vecbeta +2vecgamma` is collinear with `vecalpha`, then `vecalpha+3vecbeta +6vecgamma` is

A

`vecgamma`

B

`vec0`

C

`vecalpha+vecgamma`

D

`vecalpha`

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