I just stunk at this passage (one wrong on the section otherwise)--so take my comments with a grain of salt, I am certain I completely messed up the scale for this one, and being the first to post about this question doesn't give me much confidence but I have to take issue with the correct answer choice D.
More specifically, the usage of the word "sounds". I recognize from the passage (particularly paragraph 3) that the switch to Spanish is in fact for expressing attitudes. But isn't there a difference between words that sound expressive and words that are expressive?
I know this is the best answer based on the choices, I guess this is just symptomatic of a larger issue I have with certain LSAT questions--sometimes we are expected to be incredibly attuned to the minutiae of meanings and sometimes we aren't.