Answer:
A and D
Explanation:
You want to know which pair of lines in the figure is perpendicular.
Perpendicular
The lines are perpendicular if they meet at an angle of 90°.
Vertical line A is perpendicular to horizontal line D.
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Additional comment
If the given lines were altitudes of their respective triangles, and if the figure were a regular hexagon, then more pairs of lines would be perpendicular. Alas, the figure seems wider than tall, and the lines don't seem to be perpendicular to the sides they intersect (except line D). Hence there appears to be only one perpendicular pair.
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