Help please Does this graph represent a function? why or why not?

A. No, because it is not a curve

B. No, because it fails the vertical line test

C. Yes, because it passes the vertical line test.

D. Yes, because it has two straight lines

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?