Hey there!
So, from looking at this question, the bottom or the (

-axis) is

. So, this would mean that, the (

-axis) would be (how much) each game would cost.
So, based from the option's listed above, the correct answer to this question would actually be
(The cost of every 1 video game rented). This would be the main and the key point of this graph, how much each game would be.
You correct answer would be . . . . . .

Hope this helps.
~Jurgen