Explanation: Ahmedabad is the largest city in the state of Gujarat, India. It is located on the banks of the Sabarmati River and is a significant urban center in western India. The city has a rich history dating back to the 11th century and has been a major hub for trade and commerce throughout its existence. Ahmedabad is known for its textile industry, which has been a cornerstone of the city's economy for centuries. Additionally, the city is home to numerous historical landmarks, including the Sabarmati Ashram, where Mahatma Gandhi lived and worked during the Indian independence movement.
The population of Ahmedabad is the largest in Gujarat, making it the most populous city in the state. It is also a major industrial and commercial center, with a diverse economy that includes sectors such as textiles, pharmaceuticals, and information technology. The city's strategic location and well-developed infrastructure have contributed to its growth and importance.
In contrast, Patna is the capital city of the state of Bihar, located in eastern India. It is not related to the geography of Gujarat and is a different urban center with its own historical and cultural significance. Similarly, Lucknow is the capital city of Uttar Pradesh, located in northern India, and is not part of Gujarat's geography.
Therefore, Ahmedabad is the correct answer as it is the largest city in Gujarat, both in terms of population and economic activity. Understanding the geography and urban hierarchy of Gujarat is crucial for students studying the state's history, economy, and culture.