Which of the following best states the principle that determines the direction of an induced current in a conducting loop?
a) The induced current flows in such a way that the magnetic field it produces opposes the external magnetic field that passes through the loop.
b) The induced current flows in such a way that the magnetic field it produces opposes the change in magnetic flux through the loop.
c) The induced current flows in such a way that the magnetic field it produces reinforces the change in magnetic flux through the loop.
d) The induced current only appears when a constant (unchanging) magnetic field is present inside the loop.