The root word ‘auro’ is derived from the Latin word ‘auris,’ which means ‘ear.’ Therefore, the correct answer is c) ear.
To break it down further, ‘aural’ pertains to the ear and hearing, while terms like ‘auricle’ refer to the outer part of the ear. This root is often used in medical and anatomical contexts related to hearing and auditory functions, underscoring its association with the ear itself.