Thanks for the question! I’m going to assume that this question was the one you wanted the explanation for! Though feel free to ask on others if you want.
So in this question, we’re told that M and N earn the same salary, and now we need to figure out how many of the partners have to have lower salaries than L. Well, we know that N makes less than L. And now we know that L makes the same as M, so M also is going to make less than L. And we know that G makes less than M, and J makes less than G, and H makes less than J. So each of those is also going to make less than L (by the transitive property). That makes five people we can say for sure are going to make less than L, and so the answer to this one is (C).
Hope this helps! Feel free to ask any other questions that you might have.