The variables [tex]\( A, B \)[/tex], and [tex]\( C \)[/tex] represent polynomials where [tex]\( A = x^2 \)[/tex], [tex]\( B = 3x + 2 \)[/tex], and [tex]\( C = x - 3 \)[/tex]. What is [tex]\( AB - C^2 \)[/tex] in simplest form?
A. [tex]\( 3x^3 + 2x^2 - x + 3 \)[/tex]
B. [tex]\( 3x^3 + 2x^2 - x - 3 \)[/tex]
C. [tex]\( 3x^3 + x^2 - 6x + 9 \)[/tex]
D. [tex]\( 3x^3 + x^2 + 6x - 9 \)[/tex]