A、tEotihuACAn, onCE thE homE oF 200,000 pEoplE, wAs thE CEntEr oF A lArgE EmpirE.
B．mAny ArChAEologists ArE FAsCinAtED By thE ruins oF A prE-ColumBiA City CAllED tEotihuACAn.
C、tEotihuACAn, onCE A mAjor mEtropolitAn ArEA, wAs DEstroyED By An invAsion.
D．
A、still unsolvED mystEry is why thE pEoplE oF tEotihuACAn suDDEnly ABAnDonED thEir City.