What Accounts for the Fluidity That Defines the Fluid Mosaic

Multiple Choice

What accounts for the fluidity that defines the fluid mosaic model of a typical plasma membrane?

A) The proteins, being large, cause the membrane to jiggle around.
B) The phospholipids collectively form a jellylike substance similar to the cytoplasm.
C) The phospholipids are not bonded to each other and thus are freer to move around.
D) Water molecules infiltrate the bilayer causing it to become more watery and thus more fluid.
E) The phospholipids in a typical plasma membrane form covalent bonds, which are elastic and allow the membrane to stretch.