Answer:
a. The European Union is working to address environmental concerns.
Step-by-step explanation:
This is the statement that best reflects reality. It is true that the European Union is working to address environmental concerns. In fact, the European Union has been quite successful at doing so. The use of renewable resources has signifificantly increased in recent years. Moreover, reforestation has become more widespread, and many animal populations have extended their habitats. However, a lot more work is still necessary.