What will happen to the left aileron if the control stick of a properly rigged aircraft is moved forward and to the right?

When the control stick of a properly rigged aircraft is moved forward and to the right, it causes a change in the angle of the control surfaces. In particular, moving the control stick forward typically lowers the ailerons on the left wing and raises the ailerons on the right wing. This action helps to produce a roll to the right.

In this context, the left aileron will indeed move down when the stick is pushed forward and to the right. This downward movement increases lift on the left wing, assisting in the roll to the right that the pilot desires. It's important to understand the mechanics of how control inputs affect the aircraft's flight, particularly in relation to roll control and lateral stability.

Other options do not align with the expected behavior of the ailerons in response to moving the control stick. Ailerons are designed to work oppositely on each wing; thus, they cannot remain stationary or move sideways in the scenario described.