The correct answer and the author who wrote about a barbaric king is B= Frank R. Stockton.
Explanation:
American author Frank R. Stockton wrote about a barbaric, or rather semi-barbaric king in his short story "The Lady or the Tiger" (1882).
The first line of this short story already tells us: "In the very olden time there lived a semi-barbaric king, whose ideas, though somewhat polished and sharpened by the progressiveness of distant Latin neighbors, where still large, florid, and untrammeled, as became the half of him which was barbaric."