In which century did oratorios begin?

Oratorios began in the 17th century, making this choice the correct answer. The genre developed in Italy during the late Renaissance and early Baroque periods. The term "oratorio" itself is derived from the Italian word for "prayer hall" (oratorio), where early performances were held. This genre initially served as a dramatic presentation of religious themes, often featuring soloists, choruses, and orchestration but typically not staged like an opera.

As composers sought new methods to express spiritual narratives through music, the oratorio quickly evolved, with notable early works emerging from significant composers of the time, such as Giacomo Carissimi. By the end of the 17th century, the form had established itself as a significant component of Western classical music, paving the way for prominent works in the 18th century by composers like Handel.

This historical context highlights the evolution of the oratorio from its inception in the 17th century and its growing importance in the musical landscape that followed.