The passage below (paragraph 6) adds to the development of the author’s argument mainly by . Now, I am not asking whether we should explore the universe. I also dream of the day that we become galactic citizens. The question is whether the initial exploration of space should be done by humans or by robots. I would argue that, for the moment, robotic exploration should have the upper hand.
Answer choices for the above question

A. suggesting that robotic exploration is worth considering

B. introducing the idea of global citizenship

C. claiming that robots are better than humans

D. explaining that he wants humans to explore the universe