One difference between the middle ages and the previous eras is during the middle ages

and. even the poorest were taught to read
b. people generally accepted the idea of monotheism
c. rulers built roads that allowed new ideas to spread quickly
d. people became skeptical of ideas that could not be proven by scientific method

One difference between the middle ages and the previous eras is during the middle ages people generally accepted the idea of monotheism, (Option B)

Monotheism refers to the belief in the existence of only one all poweful and almighty god that created the world, and intervenes in it.

The Middle Ages are the medieval period of European history between the fall of the Roman Empire and the beginning of the Renaissance. That period is sometimes referred to as the "Dark Ages."

yes, it can be both.