Final answer:
When a length of copper wire is moved through a magnetic field, it induces an electric current.
Step-by-step explanation:
When a length of copper wire is moved through a magnetic field, the process of magnetic induction occurs, resulting in the generation of an electric current. This happens because the changing magnetic field induces a voltage in the wire, which in turn creates an electric current.
For example, if a bar magnet is moved through a wire loop, the magnetic field lines passing through the loop change, causing an emf (electromotive force) to be induced in the loop. This induced emf drives the flow of electric current through the wire loop.
Therefore, option A) Induction of electric current, is the correct answer.