Which of the following is a primary focus during de-icing procedures?

The primary focus during de-icing procedures is to ensure the safe operation of the aircraft by removing ice from the wings and control surfaces. Ice accumulation can adversely affect the aerodynamics of an aircraft, leading to decreased lift, increased drag, and potential control issues. Therefore, during de-icing, the primary goal is to maintain the aircraft's stability and performance by ensuring that all critical surfaces are clear of ice and snow.

While other factors such as fuel efficiency, flight speed, and cabin pressure are essential aspects of overall flight operations, they are not the main focus during de-icing. Instead, the immediate priority is to guarantee the aircraft's safety and readiness for flight, making the removal of ice from wings and control surfaces the correct answer.