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Compare Cubism to neoclassicism. Why is Cubism defined as an art movement and not as an art period, like neoclassicism?

A.
Neoclassicism is classified by objects within the artwork being broken up and rearranged in a more abstract way.

B.
Cubism was an intentional movement pioneered by specific artists.

C.
Cubism lasted much longer than neoclassicism.

D.
Neoclassicism was an intentional period pioneered by specific artists.