What is one of the major issues as to why places like Cuyahoga River became so polluted?

What is one of the major issues as to why places like Cuyahoga River became so polluted?

A) People were unaware there were pollutants entering the rivers and waterways

B) Responsibility lay on one stakeholder who often refused to address the problems

C)There are multiple stakeholders who disagreed on how to help or refused to help

D) All of the above

E) None of the above (This choice is wrong)