Final answer:
The risk when connecting a drinking water supply with a non-drinking water supply is cross-connection, which can lead to contamination of the drinking water supply. Backflow prevention devices are used to prevent cross-connections and ensure the safety of the drinking water supply. The correct answer is A. cross-connection.
Step-by-step explanation:
The risk when connecting a drinking water supply with a non-drinking water supply is cross-connection, which refers to the unintended connection between the two water sources. This can lead to contamination of the drinking water supply with pollutants, chemicals, or pathogens present in the non-drinking water supply.
Cross-connections can occur in various settings, such as residential homes, commercial buildings, or public water systems. To prevent cross-connections, backflow prevention devices are used. These devices ensure that there is no backflow of contaminated water into the drinking water supply. By implementing proper cross-connection control measures and using backflow prevention devices, the risk of contamination and potential health hazards can be minimized, maintaining the safety of the drinking water supply. So, the correct answer is A. cross-connection.