Which of the following graphs represents an exponential function?
I choose C, but I'm not sure.

A is the closest to an exponential function but should be a smooth curve and not 3 straight line segments placed end to end
The graph which represent a exponential function is:
Graph A.
Exponential function--
A exponential function is a function which is in the form of:
[tex]y=f(x)=ab^x[/tex]
where a and b are integers and a,b≠0.