An example of a submerged inlet is:

A submerged inlet occurs when a water supply line has an opening that is located below the water level of the body it is drawing from, creating the potential for backflow and contamination from the non-potable water source. The option describing a hose with one end connected to a faucet and the other end submerged under water illustrates this scenario perfectly.

When the submerged end of the hose is beneath the surface of the water, there is a risk that contaminated water could be drawn back into the drinking water supply in the event of a drop in pressure. This is why protection against such situations is critical in food safety and sanitation practices.

In contrast, the other options depict situations that do not represent a submerged inlet. A sink connected directly to a sewer poses risks for cross-contamination but does not illustrate a submerged inlet in the same way. A sprinkler system is generally designed to prevent backflow and is not considered a submerged inlet either. Finally, a hose lying on the ground does not involve any aspect of being submerged and therefore does not serve as an example of a submerged inlet.