Which of the following is a defining characteristic of an oratorio?

An oratorio is primarily defined by its concert format presentation. This means that it is typically performed without the theatrical elements found in operas, such as costumes, staging, and sets. Instead, an oratorio focuses on vocal and instrumental music that is performed in a concert hall setting, allowing the audience to appreciate the music and the voices without the distraction of staged performances.

While oratorios may include dramatic elements through their narratives, they do not rely on a theatrical production with actors or elaborate staging, which distinguishes them from operas. Moreover, unlike the options suggesting a lack of vocal soloists or an exclusive focus on instrumental music, oratorios often feature vocal soloists alongside choral elements, enriching the performance with a narrative and emotive depth that is unique to this genre.