In which situation is it appropriate for Operations level responders to conduct containment operations?

The correct choice highlights the circumstances under which Operations level responders can safely and effectively engage in containment operations during a hazardous materials incident.

Operations level responders are trained to manage and mitigate incidents involving hazardous materials, focusing on containment and recovery of materials, provided it can be done safely. The mention of using either emergency shutoff valves or remote valve operations indicates that responders can utilize these mechanisms to control the release of hazardous materials. Emergency shutoff valves allow for a quick cessation of flow in the event of a leak, while remote valve operation enables responders to control valves from a safe distance, minimizing their risk exposure.

By having access to these tools, responders can act decisively to contain spills or leaks, thereby preventing further environmental contamination or threat to public safety. This flexibility in employing different techniques for containment is essential in executing a comprehensive response to a hazardous materials incident.

In contrast, the other options either limit the context inappropriately (defensive response only, the use of only remote valve operation, or safety considerations without special equipment) or do not reflect the full scope of operations that trained responders can undertake when dealing with these hazardous situations.