Rock climbing routes are rated on a numbered scale with the highest number representing the most difficult route. Sally tried a range of shoe sizes on each of several routes of varying difficulty and found that when she wore smaller shoes, she could climb routes of greater difficultly. If D represents the difficultly rating of a route sally successfully climbed and s represents the size of the shoes she wore on such a route, then which of the following could expresses D as a function of s?

Options

A. `D(s)=s^2`
B. `D(s)=sqrts`
C. `D(s)=s-3.5`
D. `D(s)=45/s`

Answer

D