it CAn BE inFErrED From BErgEr's suggEstions thAt _________.
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