Which choice most logically completes the text?

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Belonging to neither the minimalist nor the abstract art movements but heavily influencing both, Constantin Brâncuși spent his sculpting career returning to the same few themes-a kiss, a sleeping head, and a bird in flight-each rendered in pristine, simple, almost abstract forms. Perhaps the most famous example is Bird in Space (1941), a tall, slender bronze sculpture that arcs upward in a manner suggestive of flight but that otherwise lacks any identifiable characteristics of a bird. Despite the seeming simplicity of his works, the exacting standards to which Brâncuși held his work meant that he produced relatively few pieces over his career. There is thus something of a disparity between _____

the themes Brâncuși explored and the themes favored by artists he inspired.

Brâncuși's importance to the history of art and his total artistic output.

the nature of much of Brâncuși's work and the abstraction of Bird in Space.

Brâncuși's relatively limited productivity and the diversity of his sculptures.