providing performance feedback to pilots providing flight information to passengers increasing the number of aircraft at the airport increasing the number of runways at the airport
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following would be most effective in reducing air traffic congestion at a busy airport?
Possibilities:
- providing performance feedback to pilots
- providing flight information to passengers
- increasing the number of aircraft at the airport
- increasing the number of runways at the airport

increasing the number of runways at the airport