The correct answer is: C. Either I or II follows
The statement says that there has been an unprecedented increase in the number of requests for berths in most of the long distance trains during the current holiday season. This means that there is a high demand for train travel during this time.
Course of action I says that the railway authority should immediately increase the capacity in each of these trains by attaching additional coaches. This is a good course of action because it will increase the number of available berths and reduce the waiting time for passengers.
Course of action II says that the people seeking accommodation should be advised to make their travel plan after the holiday. This is also a good course of action because it will reduce the demand for train travel during the holiday season.
Therefore, either course of action I or course of action II can be taken to address the issue of the high demand for train travel during the holiday season.