Which graph comparing time and dollars would be best represented by an exponential function? A graph with no labels. A line of orange dots decreases from the top of the vertical axis to the far right of the horizontal axis.

A graph with no labels. A line of orange dots decreases from the top of the vertical axis to the middle of the horizontal axis then increases from the middle of the horizontal axis to the top right to shape a U.

A graph with no labels. A line of orange dots extends in a straight horizontal line from the middle of the vertical axis.

A graph with no labels. A line of orange dots increases in a curved line from the bottom of the vertical axis to the top right of the graph.