If veca and vecb are vectors such that |...

If `veca and vecb` are vectors such that `|veca+vecb|=sqrt(29) and veca xx (2hati+3hatj+4hatk)=(2hati+3hatj+4hatk) xxvecb,` then possible value of `(veca+vecb).(-7hati+2hatj+3hatk)` is (A) 0 (B) 3 (C) 4 (D) 8

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