题目内容：
请根据以下内容回答题：InAsia,therearespecialcompetitionswherekiteshavecomplexdesignsandarefittedwithinstrumentsthatmakemusicalsoundsasthewindblowsthroughthem.Althoughallkiteshaveasimilarstructure（结构）,theyarewidelydifferentinsizeandshape.Kite-fightingcompetitionsarealsoheld,inwhichcompetitionsustheirkitestoattackandbringdowntheiropponents’（对手）kitesorcuttheirstrings（线）.Formorethan15years,theBigWindKiteFactoryhasbeengivingkite-makingandkiteflyingclassesforthechildrenonanislandinHawaii.Initskite-makinglessons,studentscanmakekitesinaslittleas20minutes!Childrenasyoungasfouryearsoldcanlearnhowtoflyakite.JonathanSocherandhiswifeDaphnestartedthekitefactoryin1980.theirkitesaremadeofnylon（尼龙）.TheirdesignsareHawaiianthemescreatedbyDaphne.Thedesignsarecutoutofthenylonwithahotknifethatsealstheedgesandthenfasteneddirectlyontothekite.
Thekitethatisusedtogivelessonsisregulardiamondkitewitharainbowpattern.Thedifferencebetweenthiskiteandtheonestheymakeduringthelessonsisthatitisatwo-stringcontrollablekite.BigWindemployeesflythekiteandforafewminutesshowstudentshowpullingononelineandthenontheothercontrolsthedirectionthekitegoesin.Thenthecontrolsaregiventothestudents.
Jonathaninsiststhatitisnotnecessarytomakeahugeimpressivekitetohavefunmakingandflyingkites.Eventhesimpleststructurecanwork,andcangivehoursoffun.Goon,giveitatry!
Whichofthefollowingistrueaccordingtothetext?
A.Ahotknifeisusedtoironthenylon.
B.Childrenneverflykitesontheirowninflyinglessons.
C.Kitestringsmustnotbecutinkite-fightingcompetitions.
D.DaphnedesignskitesfortheBigWindKiteFactory.
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