Suppose there is a small patch of membrane from a mammalian muscle fiber, with a small volume of adjacent cytoplasm and extracellular fluid. Assume that the membrane is most permeable to K+. There are 110,000 cations and 110,000 anions in each fluid compartment. The membrane potential results from
A) only six pairs of ions sitting on the membrane.
B) the thousands of ions sitting on the membrane.
C) the overall difference intra- and extra cellular ion concentrations in the volume of cell.
D) movement of ions across the cell membrane.