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Question:

Which is the best sequence of paragraphs?

A as it is now
Explaination

The paragraphs transition from one to the next, starting with the main topic of elements, then an overview of the periodic table, then more specific to the fact that elements consist of atoms, then expanding to what happens when atoms join together, and then the conclusion of why elements are important. The other order options wouldn't make as much sense and would seem jumpy.