If $\omega$ is a complex cube root of unity and $x=\omega^2-\omega+2$ then

• Correct answer
  A

  $x^2-4 x+7=0$
• B

  $x^2+4 x+7=0$
• C

  $x^2-2 x+4=0$
• D

  $x^2+2 x+4=0$

Hence, the correct answer is option: 'A'.