<h3>Answer: Choice A</h3>
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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.