The correct option is D 2x3+3x2−2x3+1
(2x2−2x1.5+1) is not a polynomial since it contains a term in which the variable has fractional exponent.
(3x2+x−x2+2−2x2)=(x+2) is a polynomial of degree 1,
(x2+x+2)x=(x3+x2+2x) is a polynomial of degree 3.
(2x3+3x2−2x3+1)=(3x2+1) is a polynomial of degree 2.