A wildebeest is running in a straight line, which we shall call the x axis, with the positive direction to
the right. The figure below shows this animal's
velocity as a function of time. (Figure 1)

Which of the following statements must be true?

A)it is moving to the left between a and b and to the right between b and c
B)it’s acceleration is increasing
C)it’s speed is decreasing from a to b and increasing from b to c
D)it is moving to the right between a and c