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The correct choice for the pressure controlled by the second stage regulator is 11" WC. In the context of gas distribution systems, particularly in residential settings, the second stage regulator typically reduces the gas pressure from an intermediate level down to a lower pressure that is suitable for appliances.

The regulation is often measured in inches of water column (WC), with 11" WC being a standard operating pressure for many household gas appliances. This measurement ensures that the appliances receive a consistent and safe gas supply for efficient operation. Adjusting gas pressure to this level allows for optimal combustion and minimizes the risk of malfunction due to pressure fluctuations.

Understanding the significance of this pressure regulation is key for professionals involved in gas appliance installation and maintenance, ensuring both safety and efficiency in gas consumption. On the other hand, pressures like 10 PSI or 15 PSI are much higher than what is typical for residential use, while 12" WC, although close, is not the standard for most appliances, which makes 11" WC the correct and commonly accepted answer.