Which of the following best describes the proper ratio of instructional drills to familiarization drills?

The choice indicating a ratio of one instructional drill to every three years for familiarization best reflects the distinction between these types of drills and their purposes. Instructional drills focus on teaching participants the necessary skills and procedures to respond effectively in emergencies, while familiarization drills allow participants to become comfortable with their environment and the specific emergency protocols.

Having a structured approach, such as one instructional drill every three years, allows for regular reinforcement of essential skills while not overwhelming participants with frequent instructional sessions. This also ensures that participants retain knowledge over time without becoming fatigued or disengaged from the training process. In contrast, overly frequent or excessive instructional drills could lead to diminished effectiveness due to repetitiveness.

Overall, this approach recognizes the importance of both types of drills in creating a comprehensive emergency response plan while maintaining participant engagement and preparedness.