As per given above statements , we can see that
I. \(P>M,M>R \) or, \(M=R\)
II. \(Q>M,Q>N\)Q or, \(Q<N\)
III. \(N>\frac{M}{R}\)
So, by combining anyone with the other or even by combining all, we cannot reach any conclusion about who earns most.
The correct option is (C): Question cannot be answered even with information in all three statements.