Option b is the correct answer. Firoz Shah Tughlaq displayed a keen interest in history, architecture, and public welfare projects. During his rule, he brought two Ashoka Pillars to Delhi from Topra and Meerut. These monolithic pillars had remained undeciphered until then. Firoz Shah was captivated by their significance and decided to relocate them to his Feruzabad palace in Delhi. One pillar was erected near the Friday mosque in Feruzabad, and the other was placed on the ridge near Pir-Ghaib, his hunting palace. The Delhi-Topra Pillar, now located at Feroz Shah Kotla, stands 13 meters tall and is made of sandstone. Firoz Shah's actions showcased his dedication to preserving historical artifacts and enhancing the cultural heritage of Delhi.