Answer:a
Explanation:Industrial and toxic waste that is produced in cities can lead to large amounts of pollution of the urban landscape, causing many environmental and human health issues. Urban runoff; Cities contain large amounts of impervious surfaces that do not allow water to infiltrate the ground. Much of the rainwater that does fall on the urban landscape quickly runs off into rivers and streams, bringing all of the pollutants and chemicals that were present on these surfaces with them into waterways ...