Answer:
Nails.
Step-by-step explanation:
Integumentary system of the body contains skin and its derivative. The parts of the integumentary system includes the hair, nails, skin glands and nerves.
Nails are made of keratinized epithelial cell. The nails are important for the protection of the digits. They are also used for the manipulating of small objects and scraping of the objects.
Thus, the correct answer is option (D).