Which statement about fixed stabilizers is correct?

Fixed stabilizers are essential components of an aircraft's design that contribute to its stability and control. When we refer to fixed stabilizers, we are mainly talking about structures such as the horizontal stabilizer and the vertical stabilizer, which are typically located at the tail section of the aircraft, extending from the back of the fuselage.

These stabilizers serve to maintain the aircraft's balance in flight — the horizontal stabilizer helps to control pitch, while the vertical stabilizer is responsible for yaw. Their fixed nature means they are set at a specific angle and do not change during flight, allowing the aircraft to have a stable aerodynamic profile.

The other options suggest attributes that do not align with the function of fixed stabilizers. For instance, they cannot be adjusted during flight, thus ruling out any possibility of dynamic modification (making them strictly fixed). Also, they are critical for overall stability and are not just for minor adjustments; they play a significant role in maintaining controlled flight. Therefore, by correctly stating that fixed stabilizers extend from the back of the fuselage, one captures a fundamental characteristic of these vital components in the aerodynamic design of an aircraft.