Question

an urban engineer focuses on cities, and they work alongside numerous other professionals to keep a city running smoothly. what specifically might an urban engineer add to the design of a city?
○ an efficient network of buses
○ guidelines for clean air
○ an emergency plan for a disaster
○ well - functioning sewer systems

Explanation:

Urban engineers are involved in the infrastructure of a city. Sewer systems are a key part of urban infrastructure that an urban engineer would design and ensure proper functioning. An efficient bus network is more related to transportation planning (could involve urban planners more in some cases but also engineering aspects). Guidelines for clean air are more environmental policy - related (though engineering can play a role in implementing solutions). An emergency plan for a disaster is more of a multi - disciplinary (including emergency management, urban planning etc.) but sewer systems are a core engineering (civil engineering within urban engineering context) infrastructure element.

Answer:

well - functioning sewer systems