There is a larger number of a hydrophilic molecules on the outside of a cell than on the inside Identify the conditions that could equalize the intracellular and extracellular concentrations of this molecule.

A. placing intracellularly directed and extracellularly directed pumps in the membrane
B. placing only intracellularly-directed pomps in the membrane
C. not inserting any transport proteins in the membrane
D. Placing channel proteins in the membrane