In arrangement B all the magnets attract each other. Opposite poles attract each other.
What is a magnet?
An iron piece, ore, alloy, or other substance with its constituent atoms arranged in such a way that it shows magnetism qualities,
Attracting other iron-containing objects or aligning itself in a magnetic field.
There are two poles of the magnet;
1. North pole
2. South pole
Same poles repel each other while the opposite poles attract each other. In a sense, south-south and north-north repel. While the north-south and the south-north attract each other.
In diagram B In magnets 1,2and 3 . All the poles are of opposite nature. They will attract each other.
Hence in arrangement B, all the magnets attract each other.
To learn more about the magnet refer to the link;
https://brainly.com/question/13026686
