Which cranial nerves are classified as sensory cranial nerves?

The classification of cranial nerves into sensory, motor, or both is based on their primary functions. In this case, the correct choice includes the olfactory nerve (I), the optic nerve (II), and the vestibulocochlear nerve (VIII), all of which are classified exclusively as sensory nerves.

The olfactory nerve is responsible for the sense of smell, providing sensory input related to odor detection. The optic nerve is responsible for vision, transmitting visual information from the retina to the brain. The vestibulocochlear nerve, also known as the acoustic nerve, is involved in hearing and balance, carrying sensory information from the inner ear.

In contrast, the other options either include nerves that have motor functions or include nerves that are mixed, which do not fit the criteria for sensory cranial nerves. For example, option D includes the trigeminal nerve, which has both sensory and motor components, and would not be classified strictly as a sensory nerve. Therefore, option A accurately aligns with the classification of cranial nerves solely by their sensory function.