Trouillot argued that the Haitian revolution was "unthinkable" to contemporaries. What does that claim mean, given that Europeans plainly knew it was happening?

C. They lacked categories to view slave revolt as political, treating it as banditry instead

Unthinkable here means unavailable as a category, not unknown as a fact. Reports were plentiful and were fitted into frames — disorder, savagery, British intrigue — that preserved the assumption that the enslaved were not political agents. Trouillot’s argument is that the historiography then inherited those frames along with the sources.