下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。

{{B}}An oBsErvAtion AnD AnExplAnAtion{{/B}} it is worth looking At onE or two AspECts oF thE wAy A mothEr BEhAvEs towArDs hEr BABy. thE usuAl FonDling, CuDDling AnD ClEAning rEquirE littlE CommEnt, But thE position in whiCh shE holDs thE BABy AgAinst hEr BoDy whEn rEsting is rAthEr rEvEAling.CArEFul stuDiEs hAvE shown thE FACt thAt 80 pErCEnt oF mothErs holD thEir inFAnts in thEir lEFt Arms, holDing thEm AgAinst thE lEFt siDE oF thEir BoDiEs. iF AskED to ExplAin thE signiFiCAnCE oF this prEFErEnCE most pEoplE rEply thAt it is oBviously thE rEsult oF thE prEDominAnCE oF right-hAnDEDnEss in thE populAtion.By holDing thE BABiEs in thEir lEFt Arms, thE mothErs kEEp thEir DominAnt Arm FrEE For mAnipulAtions.But A DEtAilED AnAlysis shows thAt this is not thE CAsE. truE, thErE is A slight DiFFErEnCE BEtwEEn right-hAnDED AnD lEFt-hAnDED FEmAlEs; But not Enough to proviDE ADEquAtE ExplAnAtion. it EmErgEs thAt 83 pErCEnt oF right-hAnDED mothErs holD thE BABy on thE lEFt siDE, But so Do 78 pErCEnt oF lEFt-hAnDED mothErs. in othEr worDs, only 22 pErCEnt oF thE lEFt-hAnDED mothErs hAvE thEir DominAnt hAnDs FrEE For ACtions.ClEArly thErE must BE somE othEr, lEss oBvious ExplAnAtion. thE only othEr CluE ComEs From thE FACt thAt thE hEArt is on thE siDE oF thE mothEr’s BoDy.CoulD it BE thAt thE sounD oF hEr hEArtBEAt is thE vitAl FACtorAnD in whAt wAy thinking Along thEsE linEs it wAs ArguED thAt pErhAps During its ExistEnCE insiDE thE BoDy oF thE mothEr thE unBorn BABy gEt usED to thE sounD oF thE hEArt BEAt. iF this is so, thEn thE rE-DisCovEry oF this FAmiliAr sounD AFtEr Birth might hAvE A ClAiming EFFECt on thE inFAnt, EspECiAlly As it hAs just BEEn Born into A strAngE AnD FrightEningly nEw worlD、iF this is so thEn thE mothEr woulD, somEhow, soon ArrivE At thE DisCovEry thAt hEr BABy is morE At pEACE iF hElD on thE lEFt AgAinst hEr hEArt thAn on thE right.

thE FACt thAt most lEFt-hAnDED mothErs holD thE BABy on thEir lEFt siDE rEnDErs thE First ExplAnAtion unsustAinABlE.A．

A、right

B．

B、wrong

C、

C、not mEntionED