Explanations:Port cities are urban areas that are strategically located on the coast or along navigable rivers, serving as crucial centers for maritime trade and transportation. These cities play a significant role in the economic development of a country by facilitating the import and export of goods. In the context of India, several cities are renowned for their port facilities, which contribute to the nation's economic growth and international trade.
Chennai, located on the southeastern coast of India, is one of the well-known port cities. It is the capital of the state of Tamil Nadu and is a major economic hub. The Chennai Port, also known as the Ennore Port, is one of the oldest and busiest ports in India. It handles a significant volume of cargo and is a vital link for the state's trade with other countries.
Vishakapatnam, situated on the eastern coast of India in the state of Andhra Pradesh, is another important port city. It is a major industrial center and a significant port for the region. The Vishakapatnam Port, also known as the Vizag Port, is a deep-water port that handles a variety of cargo, including oil, coal, and other goods. It is a crucial port for the state's economic activities and international trade.
Delhi, on the other hand, is not a port city. It is located inland and is the capital of India. It does not have direct access to the sea and is not known for maritime trade. Delhi is a major political, cultural, and economic center, but it does not serve as a port city.
Therefore, the correct answer is that only Chennai and Vishakapatnam are well-known port cities among the given options. Understanding the geographical location and economic significance of these cities is essential to identifying them as port cities.