Question

drag the missing word into place
and all magnets have
which means they have a north and south pole
repel
attract
polarity

Explanation:

The sentence explains that magnets have a north and south pole, which is the definition of polarity. "Repel" and "attract" refer to how magnets interact with each other, not the property of having poles, so "polarity" is the correct word to fill in.

Answer:

polarity