Which Adaptation to the Plasma Membrane Allows Mammals to Hibernate

Multiple Choice

Which adaptation to the plasma membrane allows mammals to hibernate in subzero temperatures without their plasma membranes freezing?

A) increase in cholesterol content only
B) increase in protein content only
C) increase in the number of double covalent bonds in phospholipids
D) increase in both cholesterol and protein content
E) increase in both cholesterol and double covalent bonds in phospholipids