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

Multiple Choice

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

A) zero.
B) negative and variable.
C) positive and variable.
D) positive from X1 to X2 and negative from X2 to X3.
E) negative from X1 to X2 and positive from X2 to X3.