Which statement correctly differentiates primary flight controls from secondary flight controls?

• A. Secondary controls directly control aircraft attitude; primary controls modify flight characteristics.
• B. Primary controls directly control aircraft attitude (ailerons, elevator, rudder); secondary controls modify flight characteristics (flaps, trim, spoilers).
• C. Primary controls adjust altitude; secondary controls adjust airspeed.
• D. Primary controls are automatic; secondary controls are manual.

Answer: (B)