Which design style emphasizes structured lines and geometric forms?

The design style that emphasizes structured lines and geometric forms is geometric design. This style is characterized by its reliance on shapes such as squares, triangles, and circles, and it often involves a strong sense of order and symmetry. Geometric designs showcase a deliberate arrangement of elements to create forms that are visually exciting yet mathematically precise. The focus is on the balance and harmony of these shapes, which enhances the overall aesthetic appeal of the arrangement.

In contrast, abstract designs often prioritize creativity and emotional expression over structured forms, resulting in arrangements that may not adhere to specific shapes or patterns. Ikebana is a traditional Japanese floral arrangement that values simplicity, asymmetry, and natural beauty, which does not emphasize geometric forms. The vegetative design style incorporates organic shapes and an abundant use of foliage, focusing more on natural elements than on structured lines or geometry. Therefore, the focus on structured lines and geometric forms distinctly marks geometric design as the correct answer.