Which of the Following Statements Regarding the Diffusion of Nonpolar

Which of the following statements regarding the diffusion of nonpolar solutes across cell membranes is correct?

A) At equilibrium for solute X, the flux of X across cell membranes is zero
B) At equilibrium for solute X, the net flux of X across cell membranes is zero
C) At equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell
D) Both at equilibrium for solute X, the flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct
E) Both at equilibrium for solute X, the net flux of X across cell membranes is zero and at equilibrium for solute X, the concentration of X inside the cell is equal to its concentration outside the cell are correct