Satellites in orbit around the Earth A. may contain telescopes and other instruments to study space.
B. produce data of poor quality because of Earth's atmosphere.
C. must return to Earth to deliver the data that they collect.
D. all of the above

A.)

First of all, telescopes that are used in space do not need to come down from space in order for us to get info on them. Second, most probes provide tons of info, and the quality of these probes is not determined by Earth's atmosphere. Lastly, it cannot be all of the above if the other answers are not applicable.

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(I may be very sarcastic sounding but that is the result of extreme depression and tiredness.)

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