Answer:
So, the essay is about whether "Nothing Gold Can Stay" ?
Explanation:
In the third sentence we know that "nothing gold can stay" is a poem so there's no need for you to add in the fourth sentence "it is a poem becasue..." Instead try to say "The poem demostrates the elements of sound, imagery, and figurative language."
No one knows the origin, perhaps used by early man to explain the glorious deeds of heroes, almost five thousand years old.
Efficacy means “capacity for producing a desired result or effect” so i believe the answer would be D.
hope this helps!!