Step 1: Understanding the history of railways in India.
The first railway line in India was opened on 16th April 1853. It ran between Bombay (now Mumbai) and Thane, covering a distance of 34 km. This railway line marked the beginning of the Indian railway network.
Step 2: Analyzing the options.
(A) Pune-Bombay: This is incorrect. The first railway line was between Bombay and Thane, not Pune and Bombay.
(B) Bombay-Thane: Correct. The first rail in India was operated between Bombay and Thane.
(C) Bombay-Delhi: This is incorrect. The first railway line did not run between Bombay and Delhi.
(D) Pune-Delhi: This is incorrect. There was no such first rail route between Pune and Delhi.
Step 3: Conclusion.
The correct answer is (B) Bombay-Thane, as it was the first railway line in India.