Question

Christian monks taught laypeople the art of stained glass, which served which of the following functions in medieval Europe?

established the Europeans as the artistic leaders of the world

taught religious scripture to illiterate peasants through images

united the iconoclasts and anti-iconoclasts

served as recordings of epic poems

Answer 1

It taught religious scripture to illiterate peasants through images!

(It's B.)

Answer 2

Christian monks taught laypeople the art of stained glass, which served to teach religious scripture to illiterate peasants through images.
Since these peasants didn't know how to read, they had to be taught about religion in one way or another. So, paintings were used for such a purpose.