The conclusion is only concerned with whether the desire to meet expectations will affect the results. Whether there are other ways a survey can be flawed doesn’t affect whether the desire to meet expectations will affect results in a well-constructed survey.

(B) points out the possibility that respondents’ answers are UNlikely to influenced. This doesn’t point out a flaw, because we’re trying to show why respondents’ views still CAN be affected by the surveyor’s expectations.

This possibility doesn’t undermine the argument’s reasoning. If many surveyors have no expectations, that doesn’t help show why respondents’ desire to meet expectations actually could affect results.

The conclusion concerns whether a desire to MEET expectations will affect survey results. The desire to “thwart” expectations involves a desire NOT to meet expectations; this is about a different issue that the conclusion isn’t concerned with.

This possibility shows how a desire to meet expectations can still affect the results, even if the questions don’t indicate the expectations. The respondent might just wrongly assume what the surveyor expects, and answer in a way that meets those assumed expectations.