Which of the Steps in Systems-Thinking Is Illustrated in the Following

Which of the steps in systems-thinking is illustrated in the following example?
Efforts to control the opioid epidemic found that reducing the number of pills in opioid prescriptions in Emergency Departments had an impact far beyond expectations on the subsequent addiction to opioids.

A) Identify key factors or influences that impact an outcome
B) Estimate the relative strength of each of the influences
C) Examine the interactions between factors
D) Identify bottlenecks
E) Identify leverage points