After reading the option, the one with the detail from "Space Junk!" that best conveys that the author is concerned that space junk will have a negative impact on our planet is:
A. "Although space is extremely vast, most of the junk that is worrisome is orbiting Earth."
We can eliminate options B, C, and D because, even though they mention satellites and the growing amount of space junk, they do not convey the idea of danger to our planet.
That is why letter A seems to be the best option. It mentions space junk with an adjective before it: worrisome. Here, the author conveys the idea that space junk is not a good thing.
Besides that, the author mentions that such worrisome space junk is not out there in space, but is orbiting our planet instead. Therefore, we can assume it will eventually have an impact that may harm us.
With that in mind, we can choose letter A as the correct option.
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