If the electric field vector is $$\overline E = - 2{\overline a _x} + 3{\overline a _y} + 5{\overline a _z}$$     and the magnetic field vector is $$\overline H = {\overline a _x} + 3{\overline a _y} - 4{\overline a _z},$$     then $$\overline E \times \overline H $$  is equal to

A. $$ - 27{\overline a _x} - 3{\overline a _y} - 9{\overline a _z}$$

B. $$ - 2{\overline a _x} + 9{\overline a _y} - 20{\overline a _z}$$

C. $$5{\overline a _x} + 3{\overline a _y} - 10{\overline a _z}$$

D. $${\overline a _x} + {\overline a _y} + {\overline a _z}$$

Answer: Option A