Answer and Step-by-step explanation: Power Functions are of the form:

where a is scaling factor, which means, it moves the values of
up or down;
and b is exponent or power, which determines the rate of growth or decay of the function.
The difference between exponential and power functions, is that in power functions, a variable base is elevated to a fixed exponent.
For that reason, Equations:
A.

B.

C.

D.

are NOT power functions.