deficiency is of great concern in older adults as it helps not only maintain bone health, but is also needed for muscle health. By maintaining healthy levels the progression of bone and muscle decline is slowed, which in turn results in longevity and quality of life.
A. Vitamin A
B. Protein
C. Vitamin D
D. Biotin

The correct answer to the question is option C

VITAMIN D

Explanation: Vitamin D is one of the essential vitamins needed by the body,it is fat soluble and plays a vital role in increasing the rate the body( intestines) absorbs calcium,phosphate and magnesium.

Vitamin D is very important for everybody but plays a crucial role in the health of the elderly (older adults) especially their bone health.

Vitamin D helps in the absorption of Calcium in the body and calcium helps in the strengthening of bones of the body.

Vitamin D is very vital in the maintainance of bone strength as well as act as a form of hormone that helps in the regulation of the growth and development of other tissues in the body.

When Vitamin D is deficient in the body especially older adults,it will lead to muscle weakness, possible bone deformity,bone pain which are all as a result of the loss of bone tissues.

it marks things for degradation via the proteasome. it alters there celluar location.