There are 7 pieces of calligraphy you can easily find in Wangshu Inn . So, officially, it's b) 7
The exact number of calligraphy works in Wangshu Inn isn't explicitly stated in the Genshin Impact lore. However, various sources offer clues:
A Thousand Questions with Paimon quiz: This official Genshin Impact Q&A lists "8" as the answer. While not definitive, it carries weight as a developer-backed source.
Genshin Impact Wiki: Fan-compiled information mentions "7" visible calligraphy pieces scattered throughout the inn.
In-game exploration: Players can actively find 7 calligraphy pieces within the inn's main areas.
Therefore, while the official answer might be "8," the readily observable pieces incline towards "7." Ultimately, the discrepancy depends on whether you consider unseen or potentially hidden works.
So, the most accurate answer based on available evidence is:
b) 7 (with a possible 8th based on official information, though not definitively confirmed).