By definition, Exponential functions have the following form:
Where "b" is the base and the variable "x" is the exponent.
When the base "b" of an Exponential function is a number between 0 and 1, the function decreases when the value of "x" increases.
You can see in the options given in the exercise this function:
You can identify that:
Therefore, it is a number between 0 and 1.
Knowing the above, you can conclude that this function does not represent exponential growth.
The answer is: Third option.