A Hemispherical Surface (Half of a Spherical Surface) of Radius $\pi$

A hemispherical surface (half of a spherical surface) of radius R is located in a uniform electric field of magnitude E that is parallel to the axis of the hemisphere.What is the magnitude of the electric flux through the hemisphere surface?

A) ( $\pi$ R2E)
B) 4 $\pi$ R2E/3
C) 2 $\pi$ R2E/3
D) ( $\pi$ R2E/2)
E) ( $\pi$ R2E/3)