Answer:
C. It forces a person to be categorized as either one type or another
Explanation:
Whenever you look at the world as black or white, good or evil, etc., you are bot considering the millions of different varieties of shades that lie in between. For e.g. you can be very extroverted with your peers at work, but very introverted when interacting with your superiors (supervisor, manager).
Another big issue with this test is that one single person can get multiple results (which might vary a lot) when taking the tests on different days.