What can be said about this magnetic field illustration?

D. The magnetic field flows from the north pole of one magnet to the south pole of the other magnet.

Explanation:

As shown in this figure we can see that magnetic field lines are originating from one pole of the magnet and terminating at other pole of magnet

Magnetic field lines surrounds all magnet from north pole to south pole in the same way.

this type of field lines when it originates from one pole and terminate at other pole is always showing the nature of attraction between two poles of magnet

while if two poles repel each other then the magnetic field lines of two poles will repel each other and moves in such a way that they do not intersects each other.

So here correct answer will be

D. The magnetic field flows from the north pole of one magnet to the south pole of the other magnet.