Final answer:
Accumulating glycerol and anti-freezing proteins is the physiological adaptation to cold climates, helping organisms prevent ice crystal formation in their tissues.
Step-by-step explanation:
The physiological adaptation to a cold climate that is mentioned among the options provided is (b) accumulating glycerol and anti-freezing proteins.
These substances help organisms to prevent ice crystal formation in their tissues during cold periods, which is essential for survival in freezing temperatures. Glycerol works as a sort of 'antifreeze' by lowering the freezing point of the body's fluids, and antifreeze proteins inhibit the growth of ice crystals. This adaptation is distinct from behavioral adaptations such as hibernation, which is a temporary state of inactivity.