Refer to the Information Provided in Figure 1

Multiple Choice

Refer to the information provided in Figure 1.4 below to answer the question(s) that follow. Figure 1.4
-Refer to Figure 1.4. Panel A shows a curve which has a slope that is

A) first positive, then zero, and then negative.
B) first negative, then zero, and then positive.
C) infinite throughout.
D) zero throughout.