A group of adolescents were randomly divided into a control group and a treatment group.The treatment group was given inulin to consume,while the control group was given a placebo.The effect of the inulin on calcium absorption and bone density was measured at the end of one year.The conclusion of the researchers was that inulin increased the bioavailability of calcium and improved bone health.How would you describe this study?
A) The study is an intervention trial in which calcium absorption increased in the treatment group;there was also an increase in bone density in the treatment group.
B) The study is an observational study in which a higher intake of inulin was associated with increased bone density.
C) The study is an intervention trial in which calcium absorption increased in the control group;there was also an increase in bone density in the control group.
D) The study is an intervention trial in which calcium absorption increased in the treatment group,but there NO increase in bone density in the treatment group.
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