Let $a, b, c \in \mathbb{R}$ be such that $2a + 3b + 6c = 0$ and $g(x)$ be the antiderivative of $f(x) = ax^2 + bx + c$. If the slopes of the tangents drawn to the curve $y = g(x)$ at $(1, g(1))$ and $(2, g(2))$ are equal, then

  • A
    $\frac{a}{3} = \frac{b}{-8} = \frac{c}{3}$
  • B
    $\frac{a}{6} = \frac{b}{-18} = \frac{c}{7}$
  • C
    $\frac{a}{3} = \frac{b}{-6} = \frac{c}{2}$
  • D
    $a = b = c = -1$

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