题目内容：
根据以下材料回答题 Accordingtostatistics,in2007morethan6,000childrenwereexpulsed(开除)fromUSschoolsforbringinggunsandbombstoschool．
TheUSDepartmentofEducationgaveareporttotheexpulsionsassayinghandgunsaccountedfor58percentofthe6,093expulsionsin2003-20040,against7percentforrifles(步枪)orshotgunsand35percentforothertypesoffirearms．"'Thereportisaclearsignthatournation'spublicschoolsarecrackingdown(严惩)onstudentswhobringgunstoschool,"EducationSecretaryRichardRileysaidinastatement．"Weneedtobestrong-mindedaboutkeepinggunsoutofourschoolsanddoeverythingtokeepourchildrensafe．"InMarch2004,an11yearsoldboyand13yearsoldboyusinghandgunsandriflesshotdeadfourchildrenandateacherataschoolinJones-boro,Arkansas．InOctober,twowerekilledandsevenwerewoundedinashootingataMississip-pischool．Twomonthslater,a14yearsoldboykilledthreehighschoolstudentsandwoundedfiveinDasucah,Kentucky．Mostoftheexpulsions,56percent,werefromhighschools,whichhavestudentsfromaboutage13．34percentwerefromjuniorhighschoolsand9percentwerefromele-mentaryschools,thereportsaid．
FromthefirstparagraphwecaninferthatintheUSschools__________． A．studentsenjoyshooting
B．studentsareeagertobesoldiers
C．safetyisaproblem
D．studentscanmakeguns
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答案解析：