What characterizes vaudeville as a form of entertainment?

Vaudeville is characterized primarily by its diverse and eclectic variety of performances, which include comic sketches, music, dance, and other acts, making it a multi-faceted form of entertainment. This genre arose during the late 19th and early 20th centuries and was known for featuring a range of acts that entertained audiences through humor, talent, and novelty. The blend of various entertainers on a single bill, such as comedians, musicians, magicians, and dancers, contributed to its popularity, offering something for everyone.

The other options focus on specific types of performances rather than the broad spectrum that defines vaudeville. Long theatrical plays typically provide a singular narrative experience, traditional opera performances are rooted in a specific musical style, and solo musical concerts concentrate on individual artists rather than the variety aspect integral to vaudeville. Therefore, the option that reflects the true nature of vaudeville is the one highlighting comic sketches and variety shows.