Correct Answer - C
We have `vecr=xveca+yvecb+zvecc`………………i
Taking product successively with `vecbxxvecc, veccxxveca` and `vecaxxvecb` we obtain
`x=([(vecb, vecc, vecr)])/([(veca, vecb, vecc)]),y=([(vecc, veca, vecr)])/([(veca, vecb, vecc)]),z=([(veca, vecb, vecr)])/([(veca, vecb, vecc)])`
Substituting the values of `x,y,z` in (i) we get
`[(vecb, vecc, vecr)]veca+[(vecc, veca, vecr)]vecb+[(veca, vecb, vecr)]=vecc=[(veca, vecb, vecc)]vecr`