I believe it would be all of the above, not positive though. :)
Answer:
[tex]GH \parallel EF \parallel AB \parallel CD[/tex]
Step-by-step explanation:
Remember that two lines are parallel if they have the same angle of direction, or the same slope.
In the image, we see that segments have the same angle of direction.
Angle A is 47°, and its supplement is 180-47=133, which is the same angle of line EF, GH and CD.
Therefore, all horizontal lines shown in the graph are parallel.
