题目内容：
阅读材料，回答题：Losing Weight
Girls as young as 10 years old are dieting and in danger of developing unhealthy attitudes a-bout weight, body image and food, agroup of Toronto researchers reported Tuesday.
Their study of 2,279 girls aged 10 to 14 showed that while the vast majority had healthyweights, nearly athird felt they were overweight and were trying to lose pounds. Even at the tenderage of 10, nearly 32 percent of girts felt" too fat" and 31 percent said they were trying to diet.
McVey, aresearcher at the Hospital for Sick Children in Toronto, and her colleagues analyzeddatA．collected in anumB．er of surveys of southern Ontario school girls B．etween 1993 and 2003, re-porting their findings in Tuesday's issue of the Canadian Medical Association Journal.
Nearly 80 percent of the girls had ahealthy B．ody weight and only 7.2 percent were consid-ered overweight using standard weight-to-height ratios. Most researchers suggestthe rate of over-weight children in this country is several times higher than that figure.
Nearly 30 percent of the girls reported they were currently trying to lose weight, though fewadmitted to dangerous behavior such as self-induced vomiting.
Still, atest that measured attitudes towards eating showed 10.5 percent of survey participantswere already at risk of developing an eating disorder.
"We're not talking about kids who've been prescribed adiet because they're above averageweight or overweight. We're talking about children who are within ahealthy weight range. And theyhave taken it upon themselves to diet to lose weight," McVey said, acknowledging she found therates disturB．ing. She said striking abalance between healthy weights and healthy attitudes towardsfood and body image is acomplex task ,with no easy solutions.
The study showed that most of the girls__________. A．were overweight
B．were on adiet
C．had unhealthy attitudes about weight
D．had ahealthy body weight
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