Read the excerpt from Echo Narcissus.

Until this day, Echo's voice can be heard in the canyons of the mountains, echoing after the voices of those who pass by — "Hello … hello … Can you hear me? … hear me, hear me, hear me" with ringing tones that quickly fade.

Which mythical element is best represented in this excerpt?

an explanation of the natural world
the appearance of nonhuman gods
a presence of magical elements
a lesson about the meaning of life