Which nerve primarily innervates the upper eyelid?

The UPPER EYELID (sensory) is innervated by the OPHTHALMIC BRANCH (V1) of the trigeminal nerve — specifically the frontal nerve (supraorbital and supratrochlear branches) and lacrimal nerve. V2 (maxillary) supplies the lower eyelid via the infraorbital nerve. V3 mandibular supplies lower face/jaw. The facial nerve (VII) provides MOTOR innervation to the orbicularis oculi muscle (closes eye) but NOT sensory. A is correct for primary sensory innervation.