Mia walks up to a claw machine with a pocket full of quarters. She spends them at a rate of two every minute until she runs out.

Part A

If the number of quarters Mia has is graphed over time, which feature of the graph corresponds to the rate at which Mia spends the quarters?
A. the x-intercept
B. the slope
C. the y-intercept
D. the minimum value
Part B

What is the slope?
A. 2
B. 60
C. −60
D. −2