75
50
90
100
Answer is Right!
Answer is Wrong!
The correct answer is D. 100%.
The M/E train must have 100% of brake power in the enroute. This is because the M/E train is responsible for carrying passengers and cargo, and it is important to ensure that the train can stop safely in the event of an emergency. If the M/E train does not have 100% of brake power, it may not be able to stop in time, which could result in a serious accident.
Option A, 75%, is incorrect because it is not enough brake power to ensure the safety of the train. Option B, 50%, is also incorrect for the same reason. Option C, 90%, is incorrect because it is not the minimum required brake power for the M/E train.
Therefore, the correct answer is D. 100%.