What action from city officials would explain the results in the graph above? 1. City officials increased the number of new factories being built along the water to prevent chemical runoff from getting into the water.   2. City officials began treating the water and replaced old pipes that were leaching chemicals into the water.   3. City officials implemented public service announcements to discourage the amount of trash being thrown out of car windows   4. City officials continued to ignore the problem with the water, but began to prescribe medications to the people with illnesses.

In 2014, city officials in Flint, Michigan switched their drinking water supply from Detroit’s

system to the Flint River to save money. Poor treatment and testing of the water resulted in a

crisis. The health of many residents was affected, including the outbreak of Legionnaires'

disease (a severe form of pneumonia) that killed 12 and sickened at least 87 people between

June 2014 and October 2015. City officials ignored the problem for 18 months, but began

testing the water supply once it caught the media’s attention. The results from 2016-2018 water

tests for the amount of lead and copper in the water in parts per billion (ppb) can be seen

below.

What action from city officials would explain the results in the graph above?