ACCorDing to thE proFEssor, why wAs thE Box shApE A mAjor DEvElopmEnt in homE BuilDing A、it wAs EAsiEr to BuilD thAn thE rounD shApE. B.it lED to thE invEntion oF thE winDow. C.it CoulD BE Built in A shortEr lEngth oF timE D.it AllowED rooms to BE joinED to onE AnothEr.