Answer: Choice A
=======================================================
Step-by-step explanation:
Place your pencil on the curve. Then draw a straight vertical line either up or down until you reach the x axis. If you were to start at the left endpoint, and work your way to the right, you'll eventually shade the interval
along the x axis.
We have two separate intervals being shaded in. There's a small gap from 3 to 4 that isn't shaded in.
Refer to the diagram below.