Why Is the Interior of the Plasma Membrane Potentially Impermeable

Multiple Choice

Why is the interior of the plasma membrane potentially impermeable to water-soluble molecules?

A) The hydrophobic tails of the phospholipid molecules are found there.
B) The hydrophilic tails of the phospholipid molecules are found there.
C) The ion channels are found there.
D) The cholesterol molecules in the plasma membrane are found solely in the interior of the membrane.