A plane wave $$E = 100 \sin(\omega t - 10 x) V/m$$ in a loss less medium with $$\mu = 4 \mu_o, ε = ε_o$$ strikes another medium with 90 degree angle of incidence having $$\mu = 9 \mu_o, ε = ε_o$$, the reflection co-efficient is:

A

0.5

B

0.25

C

0.1

D

0.2