What connection does the author draw between the way humans would be treated on another planet and the way we treat other organisms?

A. He suggests that they would handle human embryos with an abundance of caution, control, and curiosity, as we do with invasive or potentially dangerous species.

B. He theorizes that inhabitants of other planets would seek out our knowledge and advice about protecting the environment.

C. He maintains that we would likely be eliminated, just as we have eradicated many disease-causing microorganisms.

D. He notes that we would not be able to survive on other planets, in much the same way that the actions of humans make it more difficult for other species to survive on Earth.