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Option 2 : QSPR
The first sentence introduces the main topic of the tsunami, and its consequences.
The sentence that most logically follows sentence 1 should be Q, since it expands on the topic of the tsunami by describing why and how it was triggered.
The next sentence should be S since it expands upon the topic of Anak Krakatau, mentioned previously in sentence Q.
Out of the two remaining sentences, the sentence that comes first must be P since sentence R directly references and expands upon the tsunami-detection system first introduced only in P.
Hence, the correct order should be: QSPR.
Hence, option 2 is correct.
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