The correct answer is d) lacrimal. The lacrimal bones are small, flattened structures located in the medial wall of each eye socket. They play a crucial role in the tear drainage system, housing the lacrimal sac, which collects tears from the eye and drains them into the nasal cavity through the nasolacrimal duct.
The other options are incorrect: the nasal bones form the bridge of the nose, the frontal bone makes up the forehead, and the parietal bones form the sides and roof of the skull. Thus, when it comes to the tiny bones that specifically bear tear ducts, the lacrimal bones are the ones responsible.