Final answer:
Option (D), The final love duet in 'The Coronation of Poppea' is described by its ground bass form, a repeating bass-line over which the vocal harmonies intertwine, characteristic of the Baroque era.
Step-by-step explanation:
The final love duet in Claudio Monteverdi's opera, The Coronation of Poppea, is characterized by a ground bass. This musical technique involves a repeating bass-line melody over which the vocal lines of Poppea and Nerone weave their harmonies.
Unlike a traditional aria that typically showcases a single voice, or a recitative that serves more as declamatory singing, this duet is built upon a continuous musical foundation that was characteristic of the Baroque era. The answer to which best describes the form of the final love duet in The Coronation of Poppea is D. Ground bass.