Which of the following is the equation of a circle?

  • A
    $x^2 + 2y^2 - x + 6 = 0$
  • B
    $x^2 - y^2 + x + y + 1 = 0$
  • C
    $x^2 + y^2 + xy + 1 = 0$
  • D
    $3(x^2 + y^2) + 5x + 1 = 0$

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