thE tErm isolAtion DEsCriBEs______.
A．AmEriCAn ForEign poliCy During thE 1970s AnD 1980s
B．A militAry thEory BEst pArAphrAsED As "DiviDE AnD ConquEr"
C．An iDEA oF EConomiCAl BAlAnCE BEtwEEn nAtions
D．A poliCy oF nonintErvEntion in othEr CountriEs' AFFAirs