The general second-degree equation $ax^2 + by^2 + 2hxy + 2gx + 2fy + c = 0$ represents a circle if:

  • A
    $a = b = 0$ and $h = 0$
  • B
    $f = g$ and $h = 0$
  • C
    $a = b \neq 0$ and $h = 0$
  • D
    $f = g$ and $c = 0$

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