Brenna is taking a trip on a train to visit her cousins. The function y = -60x + 220 represents the number of miles to Brenna's destination, y, depending on how many hours she has been
on the train, x.

What is true about the function?

A. It is linear because the rate of change stays the
same.

B. It is linear because the rate of change is decreasing.

C. It is nonlinear because the rate of change stays the
same.

D. It is nonlinear because the rate of change is
decreasing