We can actually see here that the author primarily structure "Collecting Rocks" in the following way: B. Reported from teachers around the world.
<h3>What is structure?</h3>
Structure refers to the organisation and arrangement of a particular thing. Text or passages can be structured in such a way that one can understand what is being passed across.
Thus, we can see here that the author primarily structures "Collecting Rocks" by the reporting from teachers around the world.
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The theme is "Anything is possible; don't let anybody or anything get in your way."
Repetition helps exaggerate a point that the author is trying to convey. It highlights the main idea of what that character in the story is trying to let readers understand when stating such phrases.