The Xy Plane Is "Painted" with a Uniform Surface Charge

Multiple Choice

The xy plane is "painted" with a uniform surface charge density which is equal to 40 nC/m². Consider a spherical surface with a 4.0-cm radius that has a point in the xy plane as its center. What is the electric flux through that part of the spherical surface for which z > 0?

A) 14 N ⋅ m²/C
B) 11 N ⋅ m²/C
C) 17 N ⋅ m²/C
D) 20 N ⋅ m²/C
E) 23 N ⋅ m²/C