Which cranial nerve is responsible for upward movement of the eye?

The correct answer is that the oculomotor nerve is responsible for the upward movement of the eye. The oculomotor nerve, also known as cranial nerve III, is primarily responsible for controlling most of the eye's movements, including elevation of the eye (looking up), as well as the constriction of the pupil and maintaining an open eyelid.

The trochlear nerve, which was chosen, is responsible for the movement of the superior oblique muscle, allowing for the inward and downward movement of the eye but not specifically upward movement. The abducens nerve controls the lateral rectus muscle, resulting in lateral eye movement. The trigeminal nerve is primarily involved in sensation in the face and motor functions such as biting and chewing, and does not control eye movements. Therefore, the oculomotor nerve is the one that correctly facilitates the upward movement of the eye.