How can water pressure be increased in a distribution system?

Increasing water pressure in a distribution system can effectively be achieved by using pumps or adjusting pressure-regulating valves. Pumps work by actively pushing water through the system, thereby increasing the pressure. This is especially important in systems where water has to reach high elevations or travel long distances. Pressure-regulating valves are also crucial components that can be adjusted to maintain or increase pressure as necessary, allowing for a more controlled and effective water distribution.

Reducing pipe diameter would actually create more resistance to flow, leading to a decrease in pressure, while lowering the temperature of water does not have a significant impact on water pressure within the system. Adding chlorine is related to water treatment and sanitation, not to the management of water pressure. Hence, option B is the correct and most effective method to increase water pressure in a distribution network.