The correct answer is option 2: April 1853.
Option 1: January 1848 is incorrect because the first passenger train did not run in India in January 1848.
Option 3: May 1857 is incorrect because the first passenger train did not run in India in May 1857.
Option 4: April 1852 is incorrect because the first passenger train did not run in India in April 1852.
The correct answer is April 1853. This was a significant milestone in Indian railways as it marked the beginning of passenger train services in the country. The first passenger train ran between Bori Bunder in Mumbai (then Bombay) and Thane. This marked the launch of the first railway line in India, which was operated by the Great Indian Peninsular Railway.