5. Let the equation $a x^{2}+(a+2) x+9 a=0$ with respect to $x$ have two distinct real roots $x_{1} 、 x_{2}$, and $x_{1}<\frac{2}{5}$. Then the range of $a$ is:
(A) $a>-\frac{2}{5}$
(B) $-\frac{2}{5}<a<-\frac{2}{7}$
(C) $a<-\frac{2}{7}$
(D) $-\frac{2}{11}<a<0$
(2002, National Junior High School Mathematics Competition)
Answer: D.)



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