Which of the Following Statements About the Temperament Categories Identified

Which of the following statements about the temperament categories identified in the New York Longitudinal Study is correct?

A) Approximately 90% of the children in the study sample fell into one of three categories.
B) Nearly 40% of the children in the sample fell into the difficult category.
C) Roughly 35% of the children in the sample did not fit neatly into any of the three categories.
D) Situational variation in the nine components of temperament is unusual.