Explanation: Chennai, Kolkata, and Mumbai are three of the most significant cities in India, each with a rich history and cultural heritage. However, the question specifically asks about a characteristic that unites these cities in a particular context: their status as port cities.
Chennai, located on the southeastern coast of India, is a major port city on the Bay of Bengal. It has a long history as a port, dating back to the colonial era when it was known as Madras. The port of Chennai is one of the oldest and busiest ports in India, handling a significant volume of trade and commerce. It is a crucial economic hub for the region, facilitating the import and export of goods and contributing to the country's maritime trade.
Kolkata, situated on the eastern coast of India, is another major port city. It is located on the Hooghly River, a distributary of the Ganges, and has been a significant port since the British colonial period. The port of Kolkata is one of the largest in India and plays a vital role in the country's trade and commerce, particularly in the eastern region.
Mumbai, located on the western coast of India, is the largest port city in the country. It is situated on the Arabian Sea and is home to the Port of Mumbai, which is one of the busiest ports in India. Mumbai's port has been a key economic driver for the city and the country, facilitating trade and commerce for centuries.
While these cities are also culturally rich and significant, the question specifically asks for a characteristic that they share as port cities. Therefore, the correct answer is that Chennai, like Kolkata and Mumbai, is a port city. This characteristic is what unites these cities in the context of the question, highlighting their importance in India's maritime trade and economic landscape.
Understanding the geographical and economic significance of these port cities is essential for various competitive examinations, as it reflects the broader context of India's economic and historical development.