The correct answer is option 2: 1853.

Option 1: 1835 is incorrect. The first railway line in India was not opened for traffic in this year.

Option 3: 1858 is incorrect. Although it is close to the correct answer, the first railway line in India was opened before this year.

Option 4: 1901 is incorrect. The first railway line in India was opened much earlier than this year.

The first railway line in India was actually opened for traffic in the year 1853. This railway line was constructed between Bori Bunder in Mumbai (then known as Bombay) and Thane. It was a 34-kilometer long route and marked the beginning of railway transportation in India. The construction of this railway line was done by the Great Indian Peninsula Railway, which was the first railway company to operate in India. The opening of this railway line played a crucial role in revolutionizing transportation and commerce in India. It provided a faster and more efficient mode of transportation, connecting different regions of the country and facilitating the movement of people and goods.