What is the advantage of differential aileron movement?

Question

Question PPL(A) - Private Pilot License - Principle of Flight

QuizVDS · Accepted Answer

The drag of the downwards deflected aileron is lowered and the adverse yaw is smaller

QuizVDS · Answer

The ratio of the drag coefficient to lift coefficient is increased

QuizVDS · Answer

The adverse yaw is highe

QuizVDS · Answer

The total lift remains constant during aileron deflection

Id 80 - PPL(A) EN - What is the advantage of differential aileron movement?