Consider the following statements about the megacities of India: 1. I. Population of each megacity is more than 5 million. 2. II. All the megacities are important sea ports. 3. III. Megacities are either national or State capitals. Which of these statements are correct?

1. The question asks to verify statements about megacities in India. 2. Statement I: While definitions vary, classifying cities with population over 5 million as megacities was common. Major Indian urban agglomerations like Mumbai, Delhi, Kolkata, Chennai met this criterion around 2000. So, Statement I is considered correct in this context. 3. Statement II: This statement is incorrect. Not all Indian megacities are sea ports. For example, Delhi, Bangalore, and Hyderabad are major inland cities. 4. Statement III: This statement is largely correct for the major megacities around 2000. Delhi is the national capital, and other prominent megacities like Mumbai, Kolkata, Chennai, Bangalore, Hyderabad were State capitals. 5. Therefore, statements I and III are correct.