The graph shows the number of muffins, cookies, and brownies at a bake sale. How many more brownies than muffins are at the bake sale?

Responses
A 20, because 70 − 50 = 2020, because 70 − 50 = 20
B 20, because 65 − 45 = 2020, because 65 − 45 = 20
C 30, because 75 − 45 = 3030, because 75 − 45 = 30
D 30, because 80 − 50 = 30

The given graph is not visible, so it is not possible to determine the exact number of muffins and brownies at the bake sale. Therefore, the correct answer cannot be determined from the given information.