Which statement shows how two polynomials 4x+6 and 2x^2-8x demonstrate the closure property when multiplied?
A. 8x^3-20x^2-48x is a polynomial
B. 8x^3-20x^2+48x may or may not be a polynomial
C. 8x^2-32x^2-14x is a polynomial
D. 8x^3-32x^2+14x may or may not be a polynomial