Question id 311 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

increase the amount of fuel in the mixture to compensate for the decrease in pressure and density of the air
decrease the amount of fuel in the mixture in order to compensate for increased air density
decrease the fuel flow in order to compensate for decreased air density

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