The attitude indicator reflects the airplane's movement about which axes?

The attitude indicator is a critical instrument in an aircraft that displays the aircraft's orientation relative to the horizon. It reflects the airplane's movement about the longitudinal axis (which runs from the nose to the tail of the aircraft) and the lateral axis (which runs from wingtip to wingtip).

When the aircraft rolls (movement about the longitudinal axis), the attitude indicator shows whether the wings are level or if one wing is raised or lowered. Similarly, when the aircraft pitches (movement about the lateral axis), the indicator indicates whether the aircraft's nose is pointed up or down in relation to the horizon.

This dual capability of indicating both roll and pitch makes the attitude indicator essential for pilots to maintain proper control of the aircraft, especially in conditions of low visibility where outside references may not be available. Hence, the correct answer emphasizes this functionality of reflecting movement about both the longitudinal and lateral axes.