Thanks for the question! So let’s say that N’s salary is the same as one other partner in the firm. Well, that means we can put N and make him tie with basically anyone except L and K, since we’re told in the rules that they have greater salaries than N (and not equal to).
OK, well, let’s take a look at (C). Remember, this is a must be false question. Is it possible for L to have a lower salary than F? Well yeah, it is Let’s say that N has the same salary as H. Well, L could have a salary that’s still higher than N’s, but lower than F’s. So (C) is possible, and thus not the correct answer choice.
But what about (D)? Can L’s salary be less than H’s? Let’s say N and H earn the same salary, since that’s the lowest we could put N (since no one earns less than H, except possibly L and N, and now we’re saying N and H make the same). Well, L makes more than N, and since N and H make the same, L also has to make more than H. So it’s impossible for L to make less than H.
Hope this helps! Feel free to ask any other questions that you might have.