Which flight control causes the airplane to roll to the right?

The ailerons are the primary flight control surfaces responsible for causing an airplane to roll. When the aileron on the right wing is deflected upwards and the aileron on the left wing is deflected downwards, the lift on the right wing decreases while the lift on the left wing increases. This differential lift results in a rolling motion towards the right, allowing the aircraft to bank to the right.

In contrast, the rudder primarily controls yaw, which is the left or right movement of the aircraft's nose, and the elevator controls pitch, which affects the nose's up or down angle. Flaps, on the other hand, are used primarily to increase lift during takeoff and landing but do not contribute significantly to rolling motion. Thus, the ailerons are specifically designed to control lateral movement, making them the correct answer for inducing a roll to the right.