The Agricultural region was the center of India's economy.
B) The Agricultural region
Explanation:
The Agricultural region was the economic region that was the center of India's Economy. Agriculture was the backbone of Indian Economy and more than 75% of the population was engaged in the Agricultural activity.
The soil in India was favourable for many types of crop to grow and the changing weather helped them harvest. All different types of pulses, spices, tea, coffee etc were grown in Indian farms.
It was also exported and the markets flourished with good supply and income.