Answer:
C. 40 ≤ d ≤ 80
Explanation:
The range is the set of y-coordinates.
In this case, the vertical axis is d, so each ordered pair is (e, d), and the range is the set of d-coordinates.
40 and 80 have closed dots, so they are included, and all numbers between 40 and 80 are also included.
The range is
40 ≤ d ≤ 80