Final answer:
The figure depicts the correct explanation of aerofoil lift, showing how the shape of a wing generates lift by creating a pressure difference.
Step-by-step explanation:
The illustration in Figure 12.6(a) depicts the correct explanation of aerofoil lift. It shows the characteristic shape of a wing, tilted upward at a small angle with a longer upper surface. As a result, the air flows faster over the upper surface, reducing the pressure and creating a net upward force or lift.