What Do Art Historians Theorize Is the Explanation for the Resurgence

What do art historians theorize is the explanation for the resurgence of stone sculpture in the Romanesque period?

A) Sculptural programs could serve as much-needed large-scale employment projects.
B) Sculptural programs entertained the monks and clergy in their otherwise quiet lives.
C) Sculptural programs were less labor intensive and less expensive than wall painting.
D) Sculptural programs were a means to educate and impress an illiterate audience.