Final answer:
The architectural style that emerged in the 1920s was Art Deco, known for its rich colors, symmetry, and bold geometric shapes. The correct option is B.
Step-by-step explanation:
The style of architecture that became prominent during the 1920s is Art Deco. This style is characterized by its use of rich colors, symmetry, bold geometric shapes, simple composition, and lavish ornamentation.
Art Deco architecture emerged as a result of modernization and was significant in the period between the two World Wars, known as the Interwar period. Its development represented the integration of traditional craft motifs with Machine Age imagery and materials, making it a distinctive architectural style of its era.
Hence, Option B is correct.