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.