After a low-sunlight winter, a student who drinks only unfortified milk feels bone aches. What most likely...
Low vitamin A weakened the protective tissues that line the body, although this does not explain the aching linked to vitamin D deficiency.
Low vitamin K prevented normal clotting functions, yet it does not account for the type of joint or bone aching caused by low vitamin D.
Low vitamin D intake that weakens calcium absorption.
Low vitamin E reduced muscle protection from oxidative stress, but it is not directly related to the bone discomfort described.

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