Which genre did mystery plays primarily depict?

Mystery plays primarily depicted biblical stories, making the selection of this answer accurate. These plays were a form of medieval theater that presented dramatizations of biblical events, often derived from the stories of the Old and New Testaments. They were designed to educate the largely illiterate population about Christian teachings and moral lessons through engaging narratives and vivid performances. The emphasis was on significant religious figures and events, illustrating the Christian doctrine and highlighting moral lessons relevant to the audience of that time.

While comedy, historical events, and imaginary adventures do represent important literary genres, they do not align with the primary focus of mystery plays, which was to explore and present religious narratives.