Q 2273312246.     Let `vec(r) xx vec(a) = vec(b) xx vec(a)` and `vec(r) * vec(c) =0`, where `vec(a) * vec(c) ne 0`, then

`vec(a) * vec(c) ( vec(r) xx vec(b) ) + vec(b) * vec(c) (vec(a) xx vec(r))` equals to `..........................`

A

`vec(1)`

B

`vec(2)`

C

`vec(0)`

D

`vec(3)`

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