Which of the following substances is particularly harmful in a sewer environment?

Gasoline is particularly harmful in a sewer environment for several reasons. Firstly, it is a highly volatile and flammable substance, which poses significant risks of explosion and fire within enclosed sewer systems. When gasoline enters the sewer, it can create hazardous conditions for workers and first responders who may be required to enter these areas for maintenance or emergencies.

Additionally, gasoline can contaminate water sources and harm aquatic life. It contains hydrocarbons and other toxic compounds that can persist in the environment, leading to long-term pollution issues. Such contamination can also disrupt the biological processes that occur in wastewater treatment facilities, potentially harming the efficiency of existing treatment methods.

In contrast, while food waste, vegetable oils, and paper products can cause issues like clogs or blockages in the sewer system, they do not present the same level of acute hazard as gasoline. Food waste may decompose and contribute to gas buildup, and oils can lead to grease buildup, but neither poses the immediate danger associated with flammability and toxicity that gasoline does.