Question

drag the missing word into place
picking up a paperclip with a piece of , the teacher
explained that this magnetic rock occurs in nature.
force
repel
lodestone

Explanation:

The sentence describes a magnetic rock that occurs in nature and is used to pick up a paperclip. Lodestone is a naturally occurring magnetic rock (a form of magnetite), while "force" is a physical interaction and "repel" is a magnetic action (not a rock). So "lodestone" fits the context of a magnetic rock used here.

Answer:

lodestone