Exhibit $10-1$

The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.

Use this exhibit to answer the following question$($s$).$

$13.$ Refer to Exhibit $10-1.$ What is her angular displacement $($in rad$)$ in the first $8$ minutes?

a$.4$

b$.16$

c$.0$

d$.$

e$.8$