Cement layer is absent in which insect?

Answer: Option B

Cement layer is absent in Honeybees insects.
Epicuticle is the outermost layer that is usually thin and has a cement-like chitin-lacking structure.
In many insects a cement layer covers the wax and protects it from abrasion. In many insects, certain epidermal cells are specialized as exocrine glands.
It is not present in honeybees.