The answer is D. Because it gives the sense that they are two different things or levels of class.
Hope this helps :)
The inverse is f^-1 (x)=0
The argument relies on claims that are not backed up by facts
If you want to explain to a foreigner how to learn when to use these words, you can say that the go from more general to more specific (in: more general, at: more specific).
in: for objects inside other objects, or for location in a big context: year, country,
on: on top of other objects, or for location in middle-scale contexts: day, street
at: for location on a very small scale: moment (exact time), at specific address<span />
