The time limit for starting BD special during day is ________. A. 20 meters B. 15 meters C. 30 meters D. 40 meters

The correct answer is: C. 30 meters.

The time limit for starting BD special during day is 30 meters. This means that the train must start its journey within 30 meters of the scheduled departure time. If the train does not start within this time limit, it will be considered late and may be subject to penalties.

The other options are incorrect because they do not represent the actual time limit for starting BD special during day. Option A is 20 meters, which is too short. Option B is 15 meters, which is also too short. Option D is 40 meters, which is too long.

I hope this helps! Let me know if you have any other questions.