Ans.
Gila monster is a venomous lizard, native to Mexican states and United states. Gila monster shows adaptations to feed on Gambel's quails and cottontail rabbits according to their reproductive cycle.
The Gambel's quails and cottontail rabbits breed and lay eggs during April to May. As Gila monsters mainly depend on these two organisms as their prey, they can consume the large amount of food in a time (during their nesting period) and can store the food in the form of fat in their tails for later use.
Thus, the correct answer is 'option b). fat storage in their tails.'