PLEASE HELP!!!!!!!!!!!!!!!!

How has global cooperation changed the way societies confront common issues?
A.
Although poorer countries share knowledge, it is still difficult for wealthier countries to get the resources they need.
B.
It has helped with environmental issues, but countries still work independently to solve social, political, and economic problems.
C.
Little has changed because most common issues need to be solved by focusing on the specific needs of a population.
D.
Countries can easily share information and solutions, and they often work together to solve common issues.