Identifying the Correct Line of Symmetry
In order to determine the correct line of symmetry in the given figure, we need to carefully examine the properties of symmetry and how they apply to the shapes present.

Understanding Symmetry
Symmetry refers to a balanced and proportionate arrangement of parts on either side of a dividing line or plane. In the context of geometry, a line of symmetry is a line that divides a figure into two equal halves that are mirror images of each other.

Examining the Given Figure
In the figure provided, we can see that there are four different lines labeled as AB, CD, EF, and GH. Each of these lines could potentially serve as a line of symmetry for the figure.

Identifying the Correct Line
Upon closer inspection, we can observe that line CD is the correct line of symmetry for the given figure. This is because when the figure is folded along line CD, the two halves perfectly overlap each other, creating a mirror image.
Therefore, the correct answer is:

(B) CD
By understanding the concept of symmetry and carefully analyzing the given figure, we can confidently identify line CD as the correct line of symmetry.