3. Given the quadratic function $y$ $=a x^{2}+b x+c$ whose graph is shown in Figure 1, and let $M=$ $|a+b+c|-\mid a-b+$ $c|+| 2 a+b|-| 2 a-$ $b 1$. Then ( ).
(A) $M>0$
(B) $M=0$
(C) $M<0$
(D) Cannot determine whether $M$ is positive, negative, or 0
3. (C).

According to the problem, we get $a>0, 0.2a-b>0$. From the graph, it is easy to see that $M=-2(a-b+c)<0$.