Person A: Guten Tag! Person B:________
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Guten Appetit!
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Tschüss!
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Guten Tag!
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Gut, danke!
C
Correct answer
Explanation
When someone greets you with 'Guten Tag' (Good day), the appropriate response is to return the same greeting 'Guten Tag!' 'Guten Appetit' is said before meals, 'Tschüss' is casual goodbye, and 'Gut danke' mixes good and thank you incorrectly. The answer key is correct.