Why do personality researchers have different ideas about the number of traits (e. g., Cattell's theory has 16, Costa and McRae has 5)?
O d. Cattell used reliability and validity to analyze the data, while Costa and
McRae used factor analysis and projective method
O a. different researchers use different participants
O b. the data of factor analysis can be interpreted differently
c. Cattell leaned more toward Freud's theory of psychoanalysis, while Costa and
McRae used a more scientific approach
O e, all of the options (a, b, c, d) are all correct