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Let the vectors (2+a+b)hati+(a+2b+c)h...

Let the vectors `(2+a+b)hati+(a+2b+c)hatj-(b+c)hatk,(1+b)hati+2bhatj-bhatkand(2+b)hati+2bhatj+(1-b)hatka,b,c , in R` be co-planar. Then which of the following is true?

A

`2b=a+c`

B

`3c=a+b`

C

`a=b+2c`

D

`2a=b+c`

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