INTRODUCTION:CONCLUSION::
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announcement:news
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greeting:farewell
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birth:marriage
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arrival:salutation
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friendship:termination
B
Correct answer
Explanation
INTRODUCTION begins something, CONCLUSION ends it. GREETING begins an interaction, FAREWELL ends it. Both pairs represent complementary start-finish relationships. 'Announcement:news' doesn't fit (announcement delivers news). 'Birth:marriage' are different life stages. 'Arrival:salutation' doesn't work (salutation isn't the opposite of arrival).