21 Calm per se does not appear in the vocabulary of those who study personality and temperament.
(A) Researchers of personality and temperament challenge the belief that some people are born to be calmer thanthe others.
(B) Researchers of personality and temperament do not use the word “calm” as a label to describe one’s innatepersonal traits.
(C) Researchers of personality and temperament believe that people can achieve different degrees of calmnessthrough learning.
(D) Researchers of personality and temperament do not use the word “calm” to describe the participants in theirresearch studies.