Question id 20 - Takeoffs, Landings, and Go-Arounds - FAA PPL(A) - Private Pilot Airplane

The counter rotating vortices off the wingtips of an airplane generating lift.
The air trailing behind an aircraft due to its prop wash while on the ground
The air trailing behind an aircraft due to its prop wash in flight

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane