This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to care for molting hermit crabs
Track how much food and water your hermit crab consumes.
Pre-molt hermit crabs consume more food and water in order to prepare for the time they will spend resting before and after their molt. In most cases, these crabs are below the substrate where they will not have access to their food and water.

Select from: a). The excess food and water is stored in a molting sac where it can be accessed throughout the molt. Your crab will start consuming higher protein foods in preparation for molting as these foods offer higher energy. b). This is why your chance of molting your hermit crab is so high. Molting your hermit crab is a process of raising a single animal. c). When you're not feeding your most healthy hermit crab, there will not be any food or water available. This is because these crabs do not have energy to survive. d). Hermit crabs will eat much more food and water. This allows them to eat insects, fish, and better breathe, which helps them stay healthy and improved.
The answer is:
a).