A)4/x+x/7

B)x^-4

C)-4/7

D)x^2-4+7x

A)4/x+x/7

B)x^-4

C)-4/7

D)x^2-4+7x

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A and B are not polynomials because they each include one term that has a negative exponent

(Note: 4/x = 4x^{-1}).

C and D are polynomials (C is constant, D is quadratic).

Answer: B), since the exponent cannot be negative for a polynomial.