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The correct sequence is: EDBAC A introduces to us the subject of the paragraph that is a unit ‘parsec’. It acts as an introductory sentence where we are briefed about how the term was coined and who coined it. B states the purpose to coin the term or the unit. On reading B we get an idea that the application of the unit is in astronomy. Hence, C should follow the sentence which states B the reason that why parsec is used in astronomy and astrophysics. D then further elaborates about the unit and gives more information about its application and its types. In D it is stated that for shorter distance parsecs is used and for large scales multiples of parsecs are used. The paragraph then ends with E where the information is expanded stating that around Milky Way megaparsecs are used and gigaparsecs (Gpc) for many quasars and the most distant galaxies.
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