Five-year-old students at an elementary school were given a 30-yard head start in a race. The graph shows how far the avera A line graph with Distance, in yards, on the x axis and Age of Runner on the y axis. The x axis has a scale from 0 to 80 in increments of 10. The y axis has a scale of 0 to 6 in increments of 2. A straight line connecting 30, 5 and 60, 5 is drawn.

Which statement best describes the domain of the function represented in the graph?
A. 5 ≤ x ≤ 60, or x is from 5 to 60
B. 5 ≤ x ≤ 30, or x is from 5 to 30
C. 30 ≤ x ≤ 60, or x is from 30 to 60
D. 0 ≤ x ≤ 30, or x is from 0 to 30