A magnet pulls in an iron pin. Divya says this means the pin is also a magnet — why else would it…

Why

Divya is running the idea one way — magnets attract magnets — and assuming it must work in reverse too. But a magnet pulls on any MAGNETIC MATERIAL, like the iron in a pin, whether or not that material has been made into a magnet. An ordinary iron pin has no north and south pole of its own; on its own it will not pick up other pins or point north. Test it: pick up a pin with a magnet, then take the pin away and try to lift a second pin with the first one — it cannot, because it was never a magnet, just a piece of iron being pulled. (While it is touching the magnet it can briefly act as a weak one, but that fades the moment it is separated.) Her brother is right: being pulled by a magnet only means something contains a magnetic material like iron — it does not mean it is a magnet itself.