Residents of New City are complaining that many ponds in the area smell like sewer water. They approach city government leaders about their concerns. The city responds by sending a biologist to collect water samples to test the water. The biologist finds that algae are causing the odor. What should the government do next to solve the problem?

Decide that bleach is to be poured into local ponds since bleach is known to kill algae.
Pass an ordinance that requires residents to close their windows because of the fumes.
Investigate options for killing the algae without harming the ecosystems in the ponds.
Seek ways to move the residents to a new location until the foul algae can be removed.