Many princely rulers built opulent palaces that showcase architectural styles like:

The correct answer is: d) All of the above

Many princely rulers built opulent palaces that showcase architectural styles like Rajput, Mughal, Indo-Saracenic, and European.

• Rajput architecture is a style of Indian architecture that developed in the northwestern Indian subcontinent during the 8th to 16th centuries. It is characterized by its use of red sandstone, intricate carvings, and domed roofs. Some of the most famous examples of Rajput architecture include the Mehrangarh Fort in Jodhpur, the Hawa Mahal in Jaipur, and the Amber Fort in Jaipur.
• Mughal architecture is a style of Indian architecture that developed during the Mughal Empire (1526–1857). It is characterized by its use of white marble, intricate tile work, and large domes. Some of the most famous examples of Mughal architecture include the Taj Mahal in Agra, the Red Fort in Delhi, and the Jama Masjid in Delhi.
• Indo-Saracenic architecture is a style of Indian architecture that developed during the 18th and 19th centuries. It is a fusion of Indian and Islamic architectural styles. Some of the most famous examples of Indo-Saracenic architecture include the Victoria Memorial in Kolkata, the Gateway of India in Mumbai, and the Rashtrapati Bhavan in New Delhi.
• European architecture is a style of architecture that developed in Europe during the Middle Ages, Renaissance, and Baroque periods. It is characterized by its use of stone, arches, and columns. Some of the most famous examples of European architecture include the Colosseum in Rome, the Eiffel Tower in Paris, and the Sagrada Familia in Barcelona.