Question

works of art are the products of multiple forces at work (1 point)
separate
simultaneously
individually
against each other

Explanation:

Works of art are created by multiple forces acting at the same time. "Simultaneously" means at the same time, which fits the context. "Separately" and "Individually" imply forces acting alone, and "Against each other" implies conflict between forces, which are not appropriate here.

Answer:

B. Simultaneously