You have dug a shallow pit to collect and hold a hazardous liquid. Which control tactic is this?

The correct choice in this scenario is retention. Retention refers to the ability to capture and hold hazardous materials to prevent them from spreading and contaminating the surrounding environment. By digging a shallow pit, you create a retention area that can safely contain the hazardous liquid, preventing its movement and reducing the risk of environmental harm.

While other terms may seem relevant, they serve different functions. Containment typically involves barriers or other methods to prevent the spread of materials but does not specifically refer to capturing fluids in a holder. Detainment is generally not used in this context and focuses more on the temporary holding of individuals or items, rather than hazardous materials. Diking involves building a physical barrier, such as an earthen berm, to prevent a liquid from flowing out, and, while it is a form of containment, it does not describe the act of capturing liquid in a pit. Thus, retention is the most accurate description of using a pit to hold a hazardous liquid.