A charge of 0.80 nC is placed at the center of a cube that measures 4.0 m along each edge. What is the electric flux through one face of the cube

The magnetic  flux is  

Explanation:

From the question we are told that

    The value of the charge is  

     The length of each side of  the cube is

Generally the magnetic flux through a closed surface is  mathematically represented as

Where  D is the area enclosing the charge

  Now  a  cube is made up of six faces but in this question we are considering only one face which is mathematically represented as

So  the electric flux through one face of the cube  is  mathematically represented as

where   is the permitivity of free space with value  

substituting value  

your answer is c! hope this : )