Answer: Rocketing our trash towards the sun could eliminate our garbage
problem forever.
Explanation:
The claim that best summarizes the
author's proposal would be option D "Rocketing our trash towards the sun could eliminate our garbage
problem forever".
First and foremost, we should note that a proposal has to do with a solution to a particular problem.
Looking at the options given critically, we would realise that option A - option C are just giving some information regarding the subject.
Option D gives us the challenge that is faced and provided a solution to it. This is the main essence of a proposal.
Therefore, the correct option is D.