Explanation:
Action Research is an approach that brings together researchers and end users (theory and practice) to give practical outcomes through a process of shared knowledge creation that gives the end users to undertake practice change.
Answer:
Concerns of safety
Explanation:
This makes the most sense in my opinion.
The use of standard currency/coins help the economy of the Roman Empire because Roman coins were often used as tools by Europeans to circulate various forms of news and propaganda to the people and the world.