If you have a chance to introduce the Great Wall to international visitors, which of the following statements would you use to explain the history of the Great Wall.

A、Earlyinthe7thcenturyBC,severalancientstatesbuilttheirownboundarywalls,whichwerelaterconnectedbyQinShiHuang,theFirstEmperorofChina,andknownasthe'10,000-liLongWall'.Inthefollowing2,000years,manydynastiescontinuedtoconsolidateandextendtheGreatWall.;
B、TheGreatWall,thelargestman-madeprojectintheworld,isaspiritualiconforChinesepeople.;
C、TheGreatWallislistedasaWorldHeritageSitebyUNESCOin1987.;
D、TheWallisawindowforallcountriesintheworldtounderstandChina.ItcanexplicitlyconveyChinesepeople'svisionforpeacefuldevelopment,andthespiritofbeingbraveandpersistent.