Phospholipids of the Plasma Membrane Are Arranged

Phospholipids of the plasma membrane are arranged

A) around a central layer of cholesterol.
B) in a single layer with polar heads facing outwards.
C) as a bilayer with their nonpolar tails sandwiched between the polar heads.
D) as a bilayer with their polar heads sandwiched between the nonpolar tails.
E) as a bilayer with the polar heads facing the nonpolar tails.