Factor out the Greatest Common Factor in the polynomial.

$-3x^4+12x^3-18x^2$

• A. $3x\left(-x^2+4x-6\right)$
• B. $3x^2\left(-x^2+4x-6\right)$
• C. $3\left(-x^3+4x^2-6x\right)$
• D. $3x^2\left(-3x^4+12x^3-18x^2\right)$