Which number should be called to report a fuel spill?

The correct choice is based on the fact that the number provided is specifically designated for emergencies, including the critical situation of a fuel spill. Fuel spills can pose significant hazards, requiring immediate attention to prevent environmental damage and ensure safety in the surrounding area. The number for reporting emergencies is often part of the protocol established by the Chicago Department of Aviation to facilitate a quick response and effectively address such incidents.

While the other options may correspond to various other departments or information lines, they are not intended for emergency reporting. Therefore, being aware of which number to call in an emergency is essential for prompt and accurate reporting, which is crucial in managing safety and environmental concerns effectively.