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Option 2 : BCAD
The correct sequence should be BCAD
Sentence 1 - Gives a gross idea on what the topic is about as in B
Sentence 2- Sentence C further briefs out small characteristics related to thorax.
Sentence 3- Sentence A is somewhat a more detailed information of the topic mentioned previously. The use of the pronoun 'it' is suggestive that it follows the previous gross and brief introduction.
Sentence 4- It is like a conclusive idea which justifies the importance and why the topic is taken under study in the very first place as in D
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