This graph shows how the number of pies Alec can bake is related to the number of additional cups of sugar he buys.
What is the rate of change?
A: 4
B: 20
C: 10
D: 50
E: 1
![This graph shows how the number of pies Alec can bake is related to the number of additional cups of sugar he buys What is the rate of change A 4 B 20 C 10 D 50 class=](https://us-static.z-dn.net/files/da3/beeaf5b01f50435eaa667bf78a63e196.png)