The eccentricity of the conic $4x^2 + 16y^2 - 24x - 3y = 1$ is

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{\sqrt{3}}{4}$
  • D
    $\sqrt{3}$

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