The most accurate statement is the last one (d): Art Deco was prominently featured in architecture. Art Deco started to appear before World War I (1914) but it flourished in the 1920s, and Art Nouveau found inspiration in nature and its curvilinear and asymmetrical forms and it was in fact replaced by Art Deco (which does remain popular to this day), so the other three statements are not that accurate. Art Deco encompassed both decorative arts and architecture and interior design, but it was visibly featured in architecture, with superb examples such as the Chrysler Building in New York, the Guardian Building in Detroit or the Palais de Chaillot in Paris, just to name a few, which combine modern materials and ideas with traditional architectural styles, and feature geometric shapes (circles, triangles, rhombuses) and stepped forms.