A sCiEntist usuAlly DirECts his AttEntion towArDs proBlEms whiCh hE notiCEs hAvE no sAtisFACtory ExplAnAtion, AnD his Curiosity mAkEs him look For______ rElAtionship EvEn iF thE DAtA AvAilABlE sEEm to BE unConnECtED.
A．unDErlining
B．unDErnEAth
C．unDErgoing
D．unDErlying