A lack of Vitamin D is said to be detrimental to the maintenance of bone density. If a

scientist wanted to determine whether this view was supported by scientific evidence,

which of the following would be the best method of doing so?

Acarry out a survey of people with normal bone density to find out whether they

take Vitamin D tablets or not

Bcompare the bone density of two groups of people with low bone density after

providing only one of the groups with Vitamin D

Ccompare the incidence of people with low bone density in two different populations

Dcarry out an experiment in which a group of people with normal bone density are

exposed to very little sunlight to prevent the production of Vitamin D