The correct option is B exponent
If n is a positive integer and x is any real number, then xn corresponds to repeated multiplication
xn=(x×x×.............×x)[n times]
We can call this “x raised to the power of n,” or “x to the power of n”. Here, x is the base and n is the exponent or the power.
In representation of 2n, 2 is the base and n is the exponent.