If $(1 -x + x^2)^n = a_0 + a_1x + a_2x^2 + ....... + a_{2n}x^{2n}$, then $a_0 + a_2 + a_4 +........+ a_{2n}$ is equal to

  • A

    $\frac{1}{2} (3^n+1)$

  • B

    $\frac{1}{2} (3^n-1)$

  • C

    $\frac{1}{2} (1-3^n)$

  • D

    $\frac{1}{2} +3^n$

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