The Melancholy of Haruhi Suzumiya Pop Quiz

When Kyon went back to December 18 from January, what did Kyon promise to Nagato not to do before they traveled back in time with Asahina Mikuru?
Choose the right answer:
Option A Kyon must not talk to the other Nagato
Option B <nothing>
Option C Stay away from Asakura Ryouko
Option D Don't do anything dangerous
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