At the enroute, CC rake goods train must have ________ % of brake power. A. 75 B. 50 C. 90 D. 100

The correct answer is C. 90.

A CC rake goods train must have 90% of brake power at the enroute. This is because the train must be able to stop safely in the event of an emergency. If the train does not have enough brake power, it could derail or cause an accident.

Option A is incorrect because 75% is not enough brake power to stop a train safely. Option B is incorrect because 50% is not enough brake power to stop a train safely. Option D is incorrect because 100% is too much brake power and could cause the train to derail.