The correct answer is (a) Maharashtra.
Maharashtra has the largest number of million cities in India, with 7 cities having a population of over 1 million. These cities are Mumbai, Pune, Thane, Nagpur, Nashik, Aurangabad, and Kalyan-Dombivali.
Tamil Nadu has 6 million cities, Uttar Pradesh has 5 million cities, and West Bengal has 4 million cities.
Mumbai is the most populous city in India, with a population of over 12 million. It is the financial and commercial capital of India. Pune is the second most populous city in Maharashtra, with a population of over 6 million. It is a major educational and industrial center. Thane is the third most populous city in Maharashtra, with a population of over 3 million. It is a major industrial and commercial center. Nagpur is the fourth most populous city in Maharashtra, with a population of over 2 million. It is the second capital of Maharashtra and a major educational and industrial center. Nashik is the fifth most populous city in Maharashtra, with a population of over 1.5 million. It is a major religious and cultural center. Aurangabad is the sixth most populous city in Maharashtra, with a population of over 1.3 million. It is a major historical and cultural center. Kalyan-Dombivali is the seventh most populous city in Maharashtra, with a population of over 1.2 million. It is a major industrial and commercial center.