AMC 12 2004a Problem 5

The graph of the line $y=mx+b$ is shown. Which of the following is true?

Image:2004 AMC 12A Problem 5.png

$\text{(A) } mb<-1 \text{(B) } -1<mb<0 \text{(C) } mb=0 \text{(D) } 0<mb<1 \text{(E) } mb>1$