Which of the following buildings is best associated with the Art Deco architectural style?

The Carbide and Carbon Building is best associated with the Art Deco architectural style due to its distinct decorative features and sleek lines that characterize this movement. Art Deco emerged in the 1920s and 1930s, and the Carbide and Carbon Building, completed in 1929, embodies the opulence and glamour that define Art Deco design.

This building features a black and gold color scheme, which is a hallmark of Art Deco aesthetics, as well as intricate geometric patterns and ornamental details that enhance its visual impact. Its tower form and stepped silhouette also reflect the style's tendency toward verticality and bold, stylized shapes. The building was designed to evoke a sense of modernity and luxury, key elements of the Art Deco style, making it a prominent example within the context of Chicago architecture and beyond.

The other buildings mentioned do not encapsulate the quintessential features of Art Deco in the same way. For instance, the Willis Tower's design aligns more with the modernist architectural style; the State of Illinois Building has a more simplified, functional facade that reflects the International style; and Navy Pier is primarily recognized for its eclectic and historic character rather than a specific allegiance to Art Deco principles.