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Hello! Sorry for the late reply :-/
We are experiencing some technical difficulties and are trying to fix things up as soon as we can :)
if you can you should check out the mathisfun website about polynomials
they cover everything you need to know to answer your question ^_^
We can narrow the choices down by seeing which of them cannot be a polynomial:
B has an exponential (2^x) and is therefore not a polynomial
C has a term that has an x in its denominator so it cannot be a polynomial
D has a square root of x so it cannot be a polynomial
Sorry again for the late response, and I hope I was able to help you with your question!