Answer:
Option D. 20 < x < 60 or x is from 20 to 60
Step-by-step explanation:
When a function is graphed, x coordinates of the points on graph show "domain" and y coordinates of the points represent "range"
In the graph attached domain of the function will lie from 20 to 60.
It can be shown in the form of
20 < x < 60 or (20,60)
which is the interval form of domain.
Therefore, option D is the answer.