Final answer:
The project undertaken by nurses and CNAs to decrease patient falls in a rural hospital by implementing fall risk alerts and hourly rounding for toileting needs is an example of rapid cycle change.
Step-by-step explanation:
The project described in the student's question, involving a step-down unit in a rural hospital where nurses and CNAs worked to reduce the number of falls, is an example of rapid cycle change. This approach involves implementing small, incremental changes to improve a system or process, evaluating their effectiveness, and then making adjustments as necessary. It contrasts with other options like 'failure modes', which are potential errors that could lead to negative outcomes, or 'emergent response teams', which are groups formed to deal with immediate critical situations. 'Cause implementations', another term provided in the question, is not commonly used in this context.