Two Concentric Imaginary Spherical Surfaces of Radius R and 2R

Two concentric imaginary spherical surfaces of radius R and 2R respectively surround a positive point charge −Q located at the center of the surfaces. When compared to the electric flux Φ1 through the surface of radius R, the electric flux Φ2 through the surface of radius 2R is

A) .
B) .
C) Φ2 = Φ1.
D) Φ2 = 2Φ1.
E) Φ2 = 4Φ1.