Concerning Pure Extroversion and Pure Introversion, It Is Most Accurate

Concerning pure extroversion and pure introversion, it is most accurate to say

A) these categories are not types but ways to define a person's character.
B) that knowing if someone is extroverted or introverted tells you little about how conscientious, kind, or open to new ideas the person is.
C) each of these types is a specific collection of maladaptive traits.
D) classifying people into two or three types is more informative than rating people on a list of traits.