You can sprinkle iron filings around a magnet. Where will iron filings be attracted more?

At the center of the magnet

Equally all over the magnet

Nowhere, as iron filings are not attracted to magnets

At the poles

Iron filings are attracted to the magnetic field of a magnet.
The magnetic field is strongest at the poles of the magnet.
Therefore, the iron filings will be attracted more at the poles of the magnet, where the magnetic field is most intense.
This is why you'll often see iron filings forming a pattern that traces out the magnetic field lines, with the filings clustering at the poles.