Answer:
Option C.
Explanation:
Regulating air travel between states
, is the right answer.
The state governments invest in public buildings, water treatment systems, transportation and various other forms of essential infrastructures. The main reason for making such investment is the development of the state and to give residents quality life. Such projects generate new employment opportunities and promote full economic recovery. All three options come under the responsibilities of the state regarding infrastructure except regulating air travel between states.
