Answer:
The correct answer is A. Development of transportation.
Step-by-step explanation:
The development of transportation significantly boosted commercialism in India. With the construction of railways and the introduction of steamships in the 19th century, India's ability to transport goods and people improved dramatically. This led to the creation of new markets and facilitated the exchange of goods, both domestically and internationally. The improved transport infrastructure allowed for faster and more efficient transportation of agricultural products, textiles, and other goods, which contributed to the growth of commerce in India. However, it should be noted that the British colonial rule in India also played a significant role in the development of transportation infrastructure, as the British invested in the construction of railways and other transportation systems for their own economic benefit.