The correct answer to this open question is the following.
Although you forgot to include the options for this question we can say the following.
Cubism is defined as an art movement and not as an art period, like Neoclassicism because Neoclassicism was an intentional period pioneered by specific artists.
Cubism was a particular movement created by Pablo Picasso and Gorges Braque. It started in 1908 and ended at the beginning of the 1920s. It was focused only on painting.
On the other hand, Neoclassicism was a major movement in the 18th Century in Europe and included many arts such as painting, visual arts, poetry, music, architecture, literature, and theater. Neoclassicism had its origins in Rome, Italy.
