Over or above

I saw this question in an " outside book " called " the best ".

 

320 kilometres .............. the earth, a space station will orbit the earth.

 

a) over   b) on   c) above   d) in

 

I don't think it's  (b) or (d). If I were to guess, I'd choose (c). But, I can't say why it's better than (a). Please, let me know what you think. Thanks for your help.

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