If $1, \omega$ and $\omega^2$ are the cube roots of unity,then $(a+b+c)(a+b \omega+c \omega^2)(a+b \omega^2+c \omega) = $
- A$a^3+b^3+c^3$
- B$a^3+b^3+c^3-3abc$
- C$(a+b+c)^3-3abc$
- D$a^3+b^3+c^3+3abc$
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