In Free space, $$H=0.1 cos(\omega t-\beta x) a_{z} \frac{A}{m}$$  ($$a_{x}, a_{y}, a_{z}$$ ,are the unit vectors along x, y and z axis respectively ) The Total power passing through a square plate of side)10 cm on plane $$x + 2y = 1.0$$, is approximately :

A

42.12 mW

B

16.85 mW

C

18.84 mW

D

8.425 mW