In which direction does air flow over a wing as observed from ground?
particle A moves up and left


No, up and right


  particle B moves down and left


Yes


  particle C moves down and left


Yes

The low pressure region first pulls in the particle A, so it initially moves in the opposite direction of the wing, and then the adverse gradient over the rear part of the wing will gradually accelerate it so it ends up moving a little in the direction of the aircraft. It also ends up moving down much faster than forward, which is how the lift can be much more than the drag.

On highly cambered wings the pressure may be higher than ambient everywhere on the underside, but most wings are not cambered that much and there is some reduction of pressure under them as well, so even the particles moving under the wing accelerate a bit to the right, opposite of the wing, and only then change to moving left along the flight direction.