Chọn khẳng định đúng?

Câu hỏi: Chọn khẳng định đúng?

A. $(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}).\left(\frac{-\mathrm{a}}{\sqrt{6}}\right)=\frac{-3\mathrm{a}}{2}$

B. $(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}).\left(\frac{-\mathrm{a}}{\sqrt{6}}\right)=\frac{3\mathrm{a}}{2}$

C. $(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}).\left(\frac{-\mathrm{a}}{\sqrt{6}}\right)=\frac{-\mathrm{a}}{2}$

D. $(\frac{2\sqrt{3}-\sqrt{6}}{\sqrt{8}-2}-\frac{\sqrt{216}}{3}).\left(\frac{-\mathrm{a}}{\sqrt{6}}\right)=\frac{\mathrm{a}}{2}$