The correct answer choice that explains the understatement in these paragraphs is:
The narrator’s description of the cause as “sufficiently slight” is an example of understatement.
This choice highlights the contrast between the seemingly minor cause of astonishment (Mr. Hooper's appearance with a veil) and the strong reaction it provokes among the townspeople, emphasizing the absurdity of their reaction to what might actually be considered a trivial matter.