题目内容：
根据以下材料，回答题Howmenfirstlearnedtoinventwordsisunknown；inotherwords，theoriginoflanguageisamystery．Allwereallyknowisthatmen，unlikeanimals，somehowinventedcertainsoundstoexpressthoughtsandfeelings，actionsandthings，sothattheycouldcommunicatewitheachother；andthatlatertheyagreeduponcertainsigns，calledletters，whichcouldbecombinedtorepresentthosesoundsandwhichcouldbewrittendown．Thosesounds，whetherspoken，orwritteninletters，wecallwords．
Thepowerofwords，then，liesintheirassociations—thethingstheybringupbeforeourminds．Wordsbecomefilledwithmeaningforusbyexperience；andthelongerWelive，themorecertainwordsrecalltousthegladandsadeventsofourpast；andthemorewereadandlearn，themorethenumberofwordsthatmeansomethingtousincreases．
Greatwritersarethosewhonotoilyhavegreatthoughtsbutalsoexpressthesethoughtsinwordswhichappealpowerfullytoourmindsandemotions．Thischarmingandtellinguseofwordsiswhatwecallliterary(文字的)style．AboVeall，therealpoetisamasterofWords．Hecanconveyhismeaninginwordswhichsinglikemusic，andwhichbytheirpositionandassociationcanmovementotears．Weshouldthereforelearntochooseourwordscarefullyandusethemaccuratel3r，ortheywillmakeourspeechsillyandrude．
Theoriginoflanguage． A．isalegendhandeddownfromthepast
B．isreflectedinsoundsandletters
C．datesbacktotheprehistoricperiod
D．isaproblemnotyetsolved
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答案解析：