The correct answer is (d), Bijapur.
Gol Gumbaz is a mausoleum located in Bijapur, Karnataka, India. It was built in the 17th century by the Adil Shahi sultan Muhammad Adil Shah II. The tomb is the largest dome in India and the second largest in the world, after the Hagia Sophia in Istanbul. It is also one of the most important examples of Islamic architecture in India.
The Gol Gumbaz is a square building with a central dome. The dome is 51 meters in diameter and is supported by 12 pillars. The exterior of the building is decorated with intricate tile work and calligraphy. The interior of the tomb is decorated with marble and gold.
The Gol Gumbaz is a popular tourist destination and is one of the most visited monuments in India. It is also a UNESCO World Heritage Site.
The other options are incorrect.
(a) Hyderabad is the capital of Telangana, India. It is the sixth most populous city in India and the fourth most populous city in the Indian subcontinent. Hyderabad is a major center for education, technology, and culture.
(b) Lucknow is the capital of Uttar Pradesh, India. It is the seventh most populous city in India and the third most populous city in the Indian subcontinent. Lucknow is a major center for education, culture, and tourism.
(c) Patna is the capital of Bihar, India. It is the ninth most populous city in India and the fifth most populous city in the Indian subcontinent. Patna is a major center for education, culture, and tourism.