Which statement best differentiates primary flight controls from secondary flight controls on ATR?

Which statement best differentiates primary flight controls from secondary flight controls on ATR?

• A. Primary controls include trim surfaces and flaps; secondary controls adjust attitude.
• B. Primary controls are used for configuration adjustments; secondary adjust attitude.
• C. Primary controls adjust aircraft attitude (ailerons, elevator, rudder); secondary controls include trim surfaces and flaps/spoilers used for configuration.
• D. There is no distinction between primary and secondary controls on ATR.

Answer: (C)