Why is pressure measurement crucial when flying near a front?

Pressure measurement is critical when flying near a front because it allows for altitude adjustments. The presence of a front is associated with significant changes in atmospheric pressure, which can directly impact a pilot's ability to maintain the desired altitude. When flying close to weather systems like fronts, pilots must be aware of these pressure variations to ensure they are flying at the safe and intended altitude.

Furthermore, understanding pressure changes helps pilots anticipate and respond to turbulence and other weather-related phenomena that are common around fronts. If a pilot is unaware of these changes, it could lead to flying at an incorrect altitude, which might result in dangerously low or high flight conditions.

The other options focus on aspects that are less directly related to the immediate operational needs of flying in proximity to weather fronts. For instance, while navigation is important in general, pressure measurement is more specifically tied to altitude and safety in this context. Fuel efficiency and temperature stability, although significant in overall flight planning, do not address the urgent necessity of altitude control when flying near changing weather conditions.