What did the Civil Rights Act of 1964 do?

A, B,  C, and E are not polynomials.

A polynomial is an expression involving exponents, constants, and variables, so long as:

You are not dividing by a variable.

You are not raising a variable to a power of a negative number.

You are not raising a variable to a power of a fraction.

You are not taking the root of a variable.

Only one of these satisfies the criteria for a polynomial, and that is D. However, the 2nd term, 0x^2 is an unnecessary term, and would only be included if dividing this polynomial by another polynomial.