Answer:
when the size of the loop decreases.
when the magnetic field is tilted so it is no longer perpendicular to the page.
when the magnetic field gets stronger.
Step-by-step explanation:
In order for an induced current to occur in a conductor, the magnetic flux that passes through it must vary, this flux is given by:

Here B is the magnitude of the magnetic field, S is the area of the loop and
is the angle between the magnetic field and the surface vector. Thus, in order to have a change of the magnetic flux over time, B, S and/or
, have to change over time.