Trochlear, trigeminal and glossopharyngeal nerves are respectively IV, V and IX

There are 12 pairs of cranial nerves that present at the ventral surface of the brain. They are connected with the internal organs and regulate their functions. Trochlear is the IVth cranial nerve that regulates the eye movement. Trigeminal is the Vth cranial nerve that carries the somatosensory information from the face and head to the brain and even regulates the chewing muscle movement. Glossopharyngeal is IX cranial nerve that carries somatosensory information from tongue, pharynx, tonsils to the brain and even regulates the muscles used in swallowing. Thus, the correct answer is option D.