In "At the Tourist Centre in Boston," the speaker's tone can best be identified as D. Sarcastic.
I think it would be B or possibly C but for sure not A or D.
(I recently did a project about this book)
Nick seemed to care about a lot of the characters, marking A and D off the list. Wilson also seemed to have cared about people (especially when Myrtle died). I feel that Myrtle didn't seem to care about people whereas Myrtle seemed to be embarassing some of the characters.