多项式 $3x^{2}y-6y$在实数范围内分解因式正确的是 $($　　 $)$

A． $3y(x+\sqrt{2})(x-\sqrt{2})$B． $3y(x^2-2)$

C． $y(3x^2-6)$D． $-3y(x+\sqrt{2})(x-\sqrt{2})$