_________ thought that people could be typed into extraverts and introverts and that they had two basic mental processes—perception and judgment. Then, he divided perception into sensing and intuiting and judgment into thinking and feeling. This created four personality dimensions or traits: (1) introversion/extraversion, (2) perceiving/judging, (3) sensing/ intuition, and (4) thinking/feeling.

Which of the following is most appropriate for the blank in the above sentence?