2. The solution set of the inequality $a x^{2}+b x+c<0$ about $x$ is ( ).
A. $\left(-\frac{1}{\beta},-\frac{1}{\alpha}\right)$
B. $\left(\frac{1}{\beta}, \frac{1}{\alpha}\right)$
C. $\left(-\frac{1}{\alpha},-\frac{1}{\beta}\right)$
D. $\left(-\infty,-\frac{1}{\alpha}\right) \cup\left(-\frac{1}{\beta},+\infty\right)$
2. $C$

From the given, we have $a+\beta=-\frac{b}{a}, \alpha \beta=\frac{c}{a}$, and the solution set of $a0$ is $\left(-\frac{1}{\alpha},-\frac{1}{\beta}\right)$.