The word "pinpoint" (Line 3, Para. 1) basically means______.

A．people do not reveal their true self on every occasion
B．in most cases we should avoid contacting the observed person directly
C．the best way to know a person is by making comparisons
D．face-to-face interaction is the best strategy to uncover information about a person

A．People are better described in cold, objective terms.
B．The difficulty of getting to know a person is usually underestimated.
C．One should not judge people by their appearances.
D．One is usually subjective when assessing other people's personality.