The correct answer is letter D
Explanation: The Islamic world has a rich artistic tradition of creating highly geometric and symmetrical ornaments. The process of creating Islamic tiles has improved over the centuries. The Palaces of the Alhambra in Granada and Alcazar in Seville, as well as the great Mosque of Cordoba in Spain are examples of the wide variety of geometric patterns on their floors, walls and ceilings.
I think the answer to your question you ask is the letter b. the second to last.
It lead to the holocaust and the death of many Russian citizens