One major difference between opera buffa and opera seria is

A. opera buffa makes fun of the middle class, while opera seria
makes fun of the upper class.
B. opera seria was a form of 19th century opera, while
was a form of 18th century opera.
opera buffa
C. opera seria is meant to be staged in sections, while opera buffa is
meant to be watched all at once.
D. opera buffa has comic elements, while opera seria is strictly
dramatic