Where are the lavatory manual water shut-off valves located on the ERJ 175?

The lavatory manual water shut-off valves on the ERJ 175 are located in compartments under the respective sinks in both the forward and aft lavatories. This placement allows for easy access to the valves for maintenance or in case of a water-related emergency in the lavatory area. Keeping the shut-off valves under the sinks ensures that they can be quickly reached by crew members without disrupting other operations on the aircraft. This allows for efficient handling of any potential issues while maintaining safety and convenience for both passengers and crew.

Other locations, such as the cargo hold, flight deck, or behind the galley, would not provide the needed access in a timely manner during in-flight scenarios, making option B the only clear and practical choice.