Answer:
<EFC and <DCF
Step-by-step explanation:
Alternate interior angles: Angles that are inside the parallel lines and are opposite from each other
<DCA and <DCF are supplementary angles meaning they add up to 180 degrees.
<EFH and <GFC are vertical angles and both angles are not inside the parallel lines.
<BCF and <GFH are not alternate interior angles because both the angles aren't inside the parallel lines.
<EFC and <DCF are alternate interior angles because they are on opposite sides of the transversal and inside the parallel lines.
