Which of the Following Is TRUE About the Observer's Paradox

Which of the following is TRUE about the Observer's Paradox?

A) The use of recording equipment in an interview setting overcomes the Observer's Paradox by allowing respondents to understand that they are participating in scientific research
B) The use of the "Danger of Death" question overcomes the Observer's Paradox by making respondents focus on what they are saying as opposed to how they are saying it
C) The presence of friends and family is discouraged in sociolinguistic interviews if one wants to overcome the Observer's Paradox
D) While the Observer's Paradox is highly problematic for studying social variables, it is not a problem for studying regional speech
E) Focusing on linguistic features that are group exclusive is a good way to overcome the Observer's Paradox