D is the correct answer because 2*2 equals 4 and 4*2 equals 8 and 8*2 equals 16. Also, we can only find a equation with a exponent, since it asks for 16 in exponential form.
Hope this helps!
Here is your answer:
Remember that exponential forms have a power which crosses out options A, and B.
Therefore your answer is option D "2 to the 4 power."
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