Solution:
Given:
Image of lines EF and GH.
Perpendicular lines are lines intersecting each other at 90° or at a right angle.
Parallel lines are lines in a plane that are always the same distance apart. Parallel lines never intersect.
Skew lines are two lines that do not intersect and are not parallel.
Since lines EF and GH intersect at 90 degrees, then they are perpendicular.
Therefore, lines EF and GH are perpendicular.'
Option C is correct.