I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
Hope this helps!
Homework helps promote responsibility and independence in students, is a benefit of homework. That responsibility and independence that they now have can be applied to other aspects of life as well.
I don't recommend using the first person pronoun in an argumentative essay. Unless your instructor suggests that you do so, omit it from the assignment because your writing will read better without it.
Evaluate is the correct answer :).
