Which of the following is NOT a characteristic of an oratorio?

An oratorio is a large musical composition for orchestra, choir, and soloists that typically features a religious or scriptural theme. Characteristics of oratorios include the inclusion of arias and choruses, large-scale productions, and a narrative or story that conveys a significant message.

The correct response identifies that oratorios are generally less expensive than opera productions. This is largely due to the different scales and production values associated with the two forms. Operas often involve elaborate staging, costumes, and theatrical elements that can drive up costs, while oratorios usually focus more on the musical performance itself, often being performed in concert settings without the same level of theatrical presentation.

Thus, noting that an oratorio is typically not more expensive than an opera production aligns with its defining traits and the context in which each is performed.