Final answer:
The lipid layer of California king snakes helps to protect the snake from dehydration, which is evident from the passage's reference to the occlusive properties of the layer that reduce water loss.
Step-by-step explanation:
The question asks which conclusion about the lipid layer of California king snakes can be most reasonably drawn from the provided passage. The relevant information from the passage indicates that this lipid layer, along with keratin, helps reduce water loss from the skin due to its occlusive properties. This layer is part of the snake's scaly skin, which is an adaptation that's crucial for life on land. Given this information, option (A) The lipid layer helps to protect the snake from dehydration, is the conclusion that can most reasonably be drawn from the passage provided.