I don’t get it need some help please and thank you

A.  like poles of magnets repel each other

B. Unlike poles of magnets attract each other.

C. The magnet's force is stronger than the earth's at this distance

Explanation:

From the diagram given, we can take the portion of the compass painted red to be the north, and the porion painted white to be the south.

In the first diagram, the north of the compass gets attracted to the south of the compass showing, that unlike poles attract each other and like poles repel each other.

In the second diagram, the south of the compass needle gets attracted to the north of the magnet showing, that like poles repel each other, and unlike poles attract each other.

The mere fact that the compass needle is not pointing towards the north shows that it is being affected by the magnet placed beside it. Normally every compass held under the influence of the magnetic pull of the earth points north. But since this is not the case here, we can say that  The magnet's force is stronger than the earth's at this distance

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a) the particles of the chair are strongly held together.