Final answer:
Conducting a risk assessment is the key activity that helps gather information about potential hazards, which aids in responding and mitigating emergencies. Therefore correct option is D
Step-by-step explanation:
The activity that gathers information about potential hazards, thus making it easier to respond to and mitigate potential emergencies, is conducting a risk assessment. This process involves gathering information from customers and other stakeholders, finding expert information (either in person or through books or other sources), and doing a root cause analysis to identify what the real problem is. By understanding potential risks, emergency workers can effectively prepare and develop strategies to manage and respond to crises.