Find the Slope of the Line and Write the Slope $\$ 4.00$

Multiple Choice

Find the slope of the line and write the slope as a rate of change. Don't forget to attach the proper units.
-The graph shows the total cost y (in dollars) of owning and operating a mini-van where x is the number of miles driven.

A) $\$ 4.00$ per mile
B) $\$ 30.00$ per mile
C) $\$ 0.25$ per mile
D) cannot be determined