What can the Coast Guard and EPA investigate in relation to the meat packaging plant?

The Coast Guard and EPA can investigate the fish kills in the river because both agencies are responsible for protecting the environment and public health, particularly in situations involving pollution and hazardous materials. If a meat packaging plant is discharging waste or chemicals into nearby water bodies, it can lead to ecological harm, including incidents such as fish kills. Investigating these occurrences is critical for understanding the environmental impact of the plant's operations and determining if any regulatory violations have occurred.

The other options do not fall under the specific jurisdiction of the Coast Guard and EPA's environmental protection mandate. Financial records and employment practices are typically regulated by different governmental bodies focused on labor and financial oversight, while air quality standards are generally monitored by environmental agencies but would not directly relate to the operations of a meat packaging plant unless there was a direct air quality concern tied to the plant's emissions or processes.