One trap may serve a set of how many sinks that are adjacent to each other in the same room and are no further than 30 inches on center?

The correct answer indicates that one trap can effectively serve up to three sinks that are adjacent to each other and located within 30 inches on center. This is based on plumbing codes and regulations that allow for multiple fixtures to share a common trap under specific conditions, which helps streamline drainage systems while preventing issues such as clogging.

The rationale for allowing three sinks to share a trap is that this configuration maintains adequate drainage capacity and also meets code requirements regarding venting and water flow. When sinks are close together, as specified, it simplifies installation and reduces material costs, making plumbing systems more efficient.

In contrast, configurations involving two, four, or five sinks could introduce complications such as insufficient drainage or increased likelihood of clogs, especially if the hydraulic load becomes too great for a single trap to handle effectively. Thus, while multiple sinks can sometimes be connected to a single trap, best practices and regulations suggest three as the optimal limit in this scenario.