Correct option is A
Option (a) is the correct order of the given sentences.
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(R) "Museums are always" is the logical beginning as it introduces the subject.
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(S) "treasure troves of information" follows as it describes the subject.
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(P) "showcasing objects of historic, scientific and cultural interest" adds more details about the significance of museums.
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(Q) "by taking us back in time" logically concludes the sentence by explaining their impact.
Correct sentence:
"Museums are always treasure troves of information, showcasing objects of historic, scientific, and cultural interest by taking us back in time."