A Point Charge Is Located at the Origin

A point charge is located at the origin. Centered along the x axis is a cylindrical closed surface of radius 10 cm with one end surface located at x = 2 m and the other end surface located at x = 4 m. If the magnitude of the electric flux through the surface at x = 2 m is 4 N ⋅ m²/C, what is the magnitude of the electric flux through the surface at x = 4 m?

A) 1 N ⋅ m²/C
B) 2 N ⋅ m²/C
C) 4 N ⋅ m²/C
D) 16 N ⋅ m²/C
E) The correct value is not given.