What mode maintains the commanded pitch attitude by ensuring selected airspeed?

The mode that maintains the commanded pitch attitude by ensuring selected airspeed is the CLB mode. In this mode, the aircraft's autopilot system ensures that the pitch attitude aligns with the necessary parameters to achieve and sustain the selected airspeed during climb. This involves adjusting the aircraft's control surfaces to keep the airspeed stable, allowing for a consistent and controlled ascent while avoiding any stalls or excessive speed variations.

During climb, maintaining the correct airspeed is crucial for performance and safety, as it directly influences the aircraft's lift and drag characteristics. Therefore, the CLB mode is designed to automatically manage these aspects, allowing the pilot to focus on other operational tasks.

The other options relate to different flight profiles. DESCENT mode primarily focuses on controlling the rate of descent rather than maintaining airspeed. MANOEUVRE mode is utilized for more aggressive flight maneuvers, where pitch and bank angles can vary significantly. FLIGHT mode is a more generic term and may not specifically relate to a particular phase where airspeed is the primary concern, making CLB the most specific and appropriate choice for maintaining commanded pitch while ensuring the selected airspeed.