Answer: a. There were no federal regulations of water pollution at that time.
Explanation: The Cuyahoga River in Cleveland was highly polluted by sewage and industrial waste from neighboring industrial firms in the 1960s. Inflammable materials were dumped on the banks and there was a film of oil on the water. In June 1969, it caught fire from a spark on a train track and the resulted in a fire all over the river. It was not the first time this had happened but people had become more aware of the dangers of water pollution. The incident resulted in the launch of the Environmental Protection Agency. Before then, there were no federal regulations of water pollution .