Explanation: Mumbai, the largest city in India and the capital of the state of Maharashtra, is renowned for its dual roles as the commercial and financial capital of the country. This distinction is based on the city's significant contributions to the national economy through its business activities and financial institutions.
**Commercial Capital:**
Mumbai is the commercial capital of India due to its extensive business activities and the presence of numerous corporate headquarters. The city houses a large number of multinational corporations, small and medium enterprises, and a vibrant retail sector. The city's strategic location on the west coast of India, coupled with its well-developed infrastructure, makes it an ideal hub for trade and commerce. The city's port, the Port of Mumbai, is one of the busiest in the country, facilitating international trade and commerce.
**Financial Capital:**
Mumbai is also the financial capital of India, hosting the Reserve Bank of India (RBI), the central bank of the country, and the Bombay Stock Exchange (BSE), one of the oldest stock exchanges in Asia. The city is home to numerous financial institutions, including banks, insurance companies, and investment firms. The presence of these institutions and the stock exchange makes Mumbai a key player in the financial sector, influencing the country's economic policies and financial markets.
**Economic Significance:**
The dual roles of Mumbai as the commercial and financial capital are interlinked and mutually reinforcing. The city's commercial activities generate a significant portion of the country's GDP, while its financial institutions provide the necessary capital and services to support these activities. This synergy between commerce and finance makes Mumbai a crucial economic hub, contributing to the overall economic growth of the country.
**Misconceptions:**
It is important to note that while Mumbai is the commercial and financial capital, it is not the political capital of India. That role is held by New Delhi. Additionally, some might confuse Mumbai with other major cities like Kolkata or Chennai, which have their own significant roles but do not hold the same dual status as Mumbai.
In conclusion, the correct answer is (D) Only (A) & (B), as Mumbai is recognized for its roles as both the commercial and financial capital of India, making it a pivotal city in the country's economic landscape.