Gothic settings include castles, graveyards, caves, dungeons, and religious structures such as churches and chapels. They are frequently old, crumbling structures located in isolated, hidden locations such as the vastness of a forest or the isolation of the mountains.
In the first chapter, Stevenson describes the laboratory as "a certain sinister block of architecture shoved forward its gable on the roadway."
The fact that the building is 'thrusting' forward emphasizes to the reader that this building and the person who uses it are unique.
Therefore Option C is correct as it is the detail that established the Gothic Setting.
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