One Should Be Cautious in Interpreting the Results of Surveys

One should be cautious in interpreting the results of surveys on the importance of physical attractiveness in romantic relationships because

A) the research results are several decades old and therefore may not be relevant to current relationship concerns.
B) people's verbal reports often do not match their true attitudes and behaviors.
C) the definition of physical attractiveness varies significantly from person to person.
D) studies of attractiveness are concerned only with the role of physique in attraction.