If $\alpha$ is a repeated root of multiplicity 2 of the equation $18 x^3-33 x^2+20 x-4=0$, then

• Correct answer
  A

  $3 \alpha^2-8 \alpha+4=0$
• B

  $3 \alpha^2+8 \alpha+4=0$
• C

  $3 \alpha^2-\alpha-4=0$
• D

  $3 \alpha^2+2 \alpha-4=0$

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