One reason why C is wrong that I didn't see mentioned is because it says people moving into Weston failed to notify either the post office or the driver's license bureau that they had moved to the city. It doesn't say they failed to notify both. Therefore, they could still have notified one of the two and been counted in the survey.

#feedback small nit-picky typo on this page. "LSAT writes could have provided..." should be "LSAT writers could have provided..."

Would the exclusive "or" be included in this group? For example, you must sit at either this end of the table or the other end. Would this translate to X → /Y because choosing one precludes the other?