If $l, m$ $(l < m)$ are roots of $ax^2 + bx + c = 0$,then $\lim_{x \rightarrow \alpha} \frac{|ax^2 + bx + c|}{ax^2 + bx + c} = $
- A$\frac{|a|}{a}, \forall \alpha \in R$
- B$\frac{-|a|}{a}$,when $\alpha \notin (l, m)$
- C$\frac{-|a|}{a}$,when $\alpha \in (l, m)$
- D$\frac{|a|}{a}, \alpha \in (l, m)$
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