What action can the FAA take to regulate obstructions?

The FAA can proactively regulate obstructions by removing them to ensure aviation safety. This action is vital because obstructions, such as tall buildings, towers, and other structures, can pose significant risks to aircraft operations. The FAA is responsible for managing airspace and ensuring that flight paths remain clear from potential hazards. By removing an obstruction, the FAA directly mitigates risks to aviation, thereby enhancing the safety of air travel. This responsibility aligns with their mission to promote safe and efficient air transportation.

In contrast, the other options do not effectively address the issue. Self-insuring an obstruction does not resolve the risk it poses; ignoring the obstruction would be contrary to the FAA's regulatory duties and could lead to dangerous situations. Increasing the number of flights without addressing existing obstructions could elevate the risk factors in airspace management, compromising safety.