Answer:
C. Opposite Rays
Step-by-step explanation:
By definition, two rays are opposite rays, if they have the same endpoint and their union is a line.
The first letter in the name of a ray refers to its endpoint; the second refers to the name of any other point on the ray.
• The endpoint of ray ED is E.
,
• The endpoint of ray EF is E.
Thus, they have the same endpoint.
Next, joining the two rays forms line DF.
Thus, rays ED and EF are Opposite Rays.