FIGURE 2-3 -Refer to Figure 2-3. the Slope of Curve B Is

Multiple Choice

FIGURE 2-3
-Refer to Figure 2-3. The slope of curve B is

A) zero at X2.
B) always negative but variable.
C) always positive but variable.
D) undefined at X2.
E) positive from Y1 to Y2 and negative between Y2 and Y3.