A 根据下面短文回答下列问题。 miss rogErs tAught physiCs (物理) in A nEw york sChool. lAst month shE wAs tEAChing to onE oF hEr ClAssEs ABout sounD (声音). "now, i hAvE A BrothEr in losAngElEs (洛杉矶). iF i wAs CAlling him on thE phonE, AnD At thE sAmE timE you wErE 75 mEtErs AwAy listEning to mE on thE othEr siDE oF thE strEEt, whiCh oF you woulD hEAr mE EArliEr, you or my BrothErAnD why " john AnswErED, "your BrothEr, miss rogErs, BECAusE ElECtriCity (电流) trAvEls FAstEr thAn sounD wAvEs." "thAt’s vEry gooD," miss rogErs sAiD、 "i DisAgrEE," sAiD mAry. "your BrothEr woulD hEAr you EArliEr, BECAusE whEn it’s ElEvEn o’CloCk hErE, it’s Eight o’CloCk in losAngElEs.\ miss rogErs wAs tElling hEr stuDEnts ABout sounD、 [A] truE [B] FAlsE