To raise money, a school band is selling tickets to a breakfast. The graph on the coordinate grid below shows the functional relationship between the number of tickets sold and the revenue.

5004
400+
300+
200+
100+
Revenue (dollars)
0
50
Number of Tickets Sold
What is the domain of the function?
100

What is the domain of the function?
A. integers from 0 to 400
B. real numbers from 0 to 500
C. integers from 0 to 80
D. real numbers from 0 to 100