A

Bernoulli's equation relates the pressure, velocity, and height of fluid flow.
Step 1: The dynamic lift of an airplane is primarily explained by Bernoulli's principle, which states that as the speed of a fluid increases, its pressure decreases.
Step 2: The shape of an airplane wing (airfoil) creates a situation where air moves faster over the top surface and slower underneath.
Step 3: According to Bernoulli's equation, this speed difference results in lower pressure on top and higher pressure below the wing, generating lift.
Step 4: Options B, C, and D involve other phenomena and principles like viscosity and pressure, but they do not directly apply Bernoulli's equation as prominently as option A.
Therefore, the correct answer is A.