We can know
[tex]CD\perp\text{ EF}[/tex]Because they form an angle of 90°
[tex]CD\perp IJ[/tex]Because they form an angle of 90°
[tex]AB\perp GH[/tex]Because they form an angle of 90°
We only can know
[tex]EF\parallel\text{ IJ}[/tex]Because both form an angle of 90° with the same line in this case CD
therefore the correct answer is the first one
