The correct answer is: A. Motion of conductor
Fleming’s right-hand rule is a mnemonic device used to determine the direction of the induced current in a conductor. The rule states that if the thumb of the right hand is extended in the direction of the magnetic field, the forefinger is extended in the direction of the motion of the conductor, and the middle finger is extended in the direction of the induced current, then the fingers will form a right-hand screw.
In other words, the induced current will flow in the direction that a right-handed screw would rotate if it were turned in the direction of the magnetic field and the motion of the conductor.
Here is a diagram that illustrates Fleming’s right-hand rule:
[Diagram of Fleming’s right-hand rule]
In the diagram, the thumb points in the direction of the magnetic field, the forefinger points in the direction of the motion of the conductor, and the middle finger points in the direction of the induced current.
The answer to the question is A. Motion of conductor.