How does the ERJ-145 achieve effective fuel management during flight?

The ERJ-145 achieves effective fuel management during flight primarily through a complex fuel system that balances tank levels. This system is designed to ensure that fuel is distributed efficiently across the aircraft's tanks, thereby optimizing weight distribution and maintaining aircraft balance.

The fuel management system automatically monitors the fuel levels in various tanks and adjusts accordingly to maintain an even load, which is crucial for performance, fuel efficiency, and safety during flight. This automated system also helps prevent issues related to fuel imbalance, which could affect the aircraft's handling characteristics.

The other options do not specifically address the key function of managing fuel levels to ensure efficiency and safety during flight. While cabin temperature adjustment, engine heating, and manual crew intervention can play roles in the overall operation of the aircraft, they do not directly relate to the effective management of fuel during flight, indicating that the complex fuel system is the correct and most relevant answer.