题目内容：
Questionsarebasedonthefollowingpassage
Therewasatimeinmylifewhenbeautymeantsomethingspecialtome．IguessthatwouldhavebeenwhenIwasaboutsixorsevenyearsold,justseveralweeksormaybeamonthbeforetheorphanage(孤儿院)turnedmeintoanoldman．
Iwouldgetupeverymorningattheorphanage,makemybedjustlikethelittlesoldierthatIhadbecomeandthenIwouldgetintooneofthetwostraightlinesandmarchtobreakfastwiththeothertwentyorthirtyboyswhoalsolivedinmydormitory．
AfterbreakfastoneSaturdaymorningIreturnedtothedormitoryandsawthehouseparentchasingthebeautifulmonarchbutterflieswholivedbythehundredsinthebushesscatteredaroundtheorphanage．
Icarefullywatchedashecaughtthesebeautifulcreatures,oneafteranother,andthentookthegnfromthenetandthenstuckstraightpinsthroughtheirheadandwings,pinningthemontoaheavycardboardsheet．
Howcruelitwastokillsomethingofsuchbeauty．Ihadwalkedmanytimesoutintothebushes,allbymyself,justsothebutterfliescouldlandonmyhead,faceandhandssoIcouldlookatthemupclose．
Whenthetelephonerangthehouseparentlaidthelargecardboardpaperdownonthebackcement(水泥)stepandwentinsidetoanswerthephone．Iwalkeduptothecardboardandlookedattheonebutterflywhohehadjustpinnedtothelargepaper．ItwasstillmovingaboutsoIreacheddownandtoucheditonthewingcausingoneofthepinstofallout．Itstartedflyingaroundandaroundtryingtogetawaybutitwasstillpinnedbytheonewingwiththeotherstraightpin．Finallyitswingbrokeoffandthebutterflyfelltothegroundandjusttrembled．
IpickedupthetornwingandthebutterflyandIspatonitswingandtriedtogetittostickbackonsoitcouldflyawayandbefreebeforethehouseparentcameback．Butitwouldnotstayonhim．
Theauthorsetthelivingbutterflyfreebecause（ ）． A．helikeditverymuch
B．hehadsympathyforthebeautifulbutterfly
C．hecouldn'tbearabutterflydyinginhisfavoritebushes
D．itswingbrokeoff
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答案解析：