Answer:
Option C: The real tree is more detailed and smells fresher than the plastic trees that line the streets.
Explanation:
The entire story talks about the superiority, beauty and realness of the real trees in contrast with the inferiority and artificiality of the plastic trees. So the main theme of the story is summed up in option C, i.e. "The real tree is more detailed and smells fresher than the plastic trees that line the streets."
Option A is not correct because this idea does not run throughout the story; it is mentioned in just one line and is just cause of the disappearance of real trees.
Option B is incorrect because, it is just an incident in the story not a theme or idea of the whole story.
Option D is incorrect because it is part of the setting of the story with no theme in it.
