Explanation: To understand the context of the statements provided, we need to delve into the geography, history, and economic significance of Delhi.
1. **Prime Minister's Residence in Delhi**: The Prime Minister of India resides in a residence known as 7, Lok Kalyan Marg, located in New Delhi. This is the official residence of the Prime Minister and is situated in the heart of the capital city. The choice of Delhi as the seat of the Prime Minister's residence underscores its importance as the political and administrative center of the country.
2. **Pietra Dura Art Form**: Pietra Dura, also known as Parchin kari, is an intricate art form that involves the inlay of semi-precious stones into marble or other stones. This technique was widely used in Mughal architecture, particularly in the construction of the Taj Mahal and other significant monuments in Agra and Delhi. The art form requires great skill and precision, as the stones are cut and fitted into the marble to create intricate designs and patterns.
3. **Delhi as a Commercial Center**: Delhi is one of the largest commercial centers in India. It is home to numerous financial institutions, corporate headquarters, and business centers. The city's strategic location, well-developed infrastructure, and large consumer base make it a hub for trade and commerce. Delhi's economy is diverse, with significant contributions from sectors such as services, manufacturing, and retail.
Each of these statements highlights a different aspect of Delhi's significance in India. The Prime Minister's residence underscores its political importance, Pietra Dura reflects its rich cultural and historical heritage, and its role as a commercial center highlights its economic significance. Therefore, all three statements are true, making option C the correct answer.
Understanding these aspects of Delhi is crucial for anyone studying the geography, history, and economy of India. It provides a comprehensive view of the city's multifaceted role in the country's development and governance.