The correct answer is: a) Thousand Pillar Temple (Warangal).
The Kakatiya period saw the development of a distinctive temple architecture style evident in the Thousand Pillar Temple (Warangal). This style is characterized by its use of large, monolithic pillars, its intricate carvings, and its massive size. The Thousand Pillar Temple is one of the most impressive examples of this style of architecture.
The other options are also examples of Kakatiya architecture, but they do not exhibit the same distinctive style as the Thousand Pillar Temple. The Lepakshi Temple is known for its intricate carvings, but it is not as large or as impressive as the Thousand Pillar Temple. The Srisailam Temple is a large and impressive temple, but its architecture is more typical of other Hindu temples of the period. The Virupaksha Temple (Hampi) is a UNESCO World Heritage Site, but it is not an example of Kakatiya architecture. It was built during the Vijayanagara period, which followed the Kakatiya period.