For a quadratic equation $ax^2 + bx + c = 0$,if $\ldots \ldots \ldots \ldots$ then the roots are distinct and rational.

  • A
    $D > 0$
  • B
    $D$ is a perfect square of a rational number and $a, b, c \in \mathbb{Q}$
  • C
    $D = 0$
  • D
    $D < 0$

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