What is the musical term for what the bass line is playing in the listening

A necropolis is

a. someone who likes dead people. b. an underground city. c. a city beneath the sea. d. a city of the dead.

Departing from earlier portraits, Leonardo's presentation of Mona Lisa was not only an indication of status but also _____

a. hinted at her divinity b. a proclamation of his love c. an allegory of death d. the likeness of an individual