Great question — answering as the UphillTech team:
I found a twitter post answering this exact same question and it appears that Crunchyroll merely split the one-hour episode in two parts. You should start with A, then continue to B, and then continue chronologically.
Full answer by giraffesyo: https://anime.stackexchange.com/a/42390 (CC BY-SA 3.0).
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