Final answer:
Islamic art was colorful and used geometric patterns.
Step-by-step explanation:
The statement that is true of Muslim achievements is a. Islamic art was colorful and used geometric patterns.
Islamic art is known for its vibrant colors and intricate geometric designs. Geometric and vegetative motifs are popular in Islamic art and can be seen in various forms of architecture and artwork, including mosques and metalwork.
For example, mosques often feature geometric patterns in their tilework and calligraphy, as well as the use of arches and domes in their architecture.