Final answer:
The correct option is C) 25 mph. The speed limit when approaching a railroad crossing with no warning device is commonly 25 mph.
Step-by-step explanation:
The speed limit when approaching a railroad crossing with no warning device depends on the jurisdiction. However, a common speed limit in many areas is 25 mph (miles per hour). This speed limit is set to ensure the safety of both drivers and pedestrians when crossing the railroad tracks.
To give you an example, let's say you are driving toward a railroad crossing without any warning device, and the speed limit is 25 mph. This means you should not exceed 25 mph as you approach the crossing, even though there may not be any specific signage indicating the speed limit. Driving at a slower speed allows you to have enough time to react if a train is approaching or if there are any other hazards at the crossing.
Remember, it's important to always follow the posted speed limits and adjust your speed based on the road conditions and any potential hazards.