题目内容：
根据下列文章,请回答题。Old Mothers' Children Have Higher Diabetes(糖尿病)RiskChildren of older mothers run a higher risk of developing insulin dependent(胰岛素依赖型的)diabetes，theBritish Medical Journal said．“A strong association was found between increasingmaternal(母亲的)age at delivery and risk of(insulin-dependent)diabetes in thechild．Risk was highest in firstborn children and decreased progressively withhigher birth order,” Professor Edwin Gale and colleagues at South mead Hospitalin Bristol said．Diabetes is a serious，incurable，lifelong disease characterized(以…作为特性)byan inability to control the amount of sugar in the blood．Insulin-dependentdiabetes。which mainly affects children，is treated by administering the hormoneinsulin．Gale looked into 1．375 families in the Oxford area where one or morechildren had diabetes and found that the risk of a child developinginsulin-dependent diabetes increased by 25 percent for each five-year band ofthe mother's age.The risk of developing diabetes was alsolinked to the age of the father．For every five-year band of the father。8 age the risk of the child developingdiabetes increased by nine percent．The risk of diabetes was highest among thefirstborn children of mothers who started their families late and the riskdecreased by about l5 percent for each subsequent child。the BMJ said．The olderthe mother，the earlier the start of insulin．dependent diabetes in the child．Otherstudies have almery shown that children born to older mothers。over the age of35，have an increased risk of diabetes but this study is the first to establishthat risk increases continuously in relation to increasing maternal age．Dr．PollyBingley of South mead Hospital told Reuters(路透社)。The new study is the first toshow that risk is related to birth order．
Thestudy also partly explains increasing diabetes．Between l97o and 1996 the proportionof children born to mothers aged between 3o and 34 increased to 28 percent
from 15 percent and this could account forrising numbers of childhood diabetes patients，the scientists said in the B/W．
The diabetes charity Diabetes UK agreed thatthe study may have uncovered a reason for the alarming increase in the rateof(insulin-dependent)diabetes among children in recent years．“This study maywell provide a clue to the understanding of this problem．It is most likely thatthere are a number of factors to explain the increase．”Diabetes UK said．Thereare some l.4 million diagnosed diabetes sufferers in Britain。The charityDiabetes UK said．Of these l.4 million sufferers there are 20000 people under age 20 who suffer from insulin．dependent diabetes．
6 According to the passage，the risk of a child developinginsulin—dependent diabetes is linked to all the following factors EXCEPT A．the maternal age at deliver
B．the age of the fathe
C．birth orde
D．the amount of sugar he or she consume
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