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How stagnation point on the topside of the airfoil reaches the trailing edge?

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How stagnation point on the topside of the airfoil reaches the trailing edge?

(a) Due to viscous forces

(b) Due to surface forces

(c) Due to pressure forces

(d) Due to drag forces

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Question is from The Kutta Condition in division Incompressible Flow over Airfoils of Aerodynamics

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The correct option is (a) Due to viscous forces

Easiest explanation: The stagnation point on the topside of the airfoil then moves until it reaches the trailing edge. The starting vortex eventually dissipates due to viscous forces. As the airfoil continues on its way, there is a stagnation point at the trailing edge. The flow over the topside of the airfoil conforms to the upper surface of the airfoil.

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