For which interval of values of $a$ will the equation $3x^2 + 2(a^2 + 1)x + (a^2 - 3a + 2) = 0$ have roots of opposite signs?

  • A
    $(-\infty, 1)$
  • B
    $(-\infty, 0)$
  • C
    $(1, 2)$
  • D
    $(\frac{3}{2}, 2)$

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