Answer is:
<span>D. athletic issues</span>
When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
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The change in adolescence all begins as a child in their unique combination of genes<span>, brain development, environment, experiences with family and friends, and community and culture. Social and emotional changes show that they are growing independently and learning how to be an adult. Physical change in different genders are really different because both are going into puberty and so they begin to see alot of differences in their bodies. Adolescence mental starts on what they begin to see and believe, and as everything is developing in their mind many of those things stay, what they have in mind depends on them. Adolescence are still maturing to become adults.
(hope i kinda made sense)</span>
