The synthesis of Vitamin D decreases with age. This is <span>due because of a fall in 7-dehydrocholesterol levels.</span>
<span>Ans: Option C(Maintenance).</span>
Considering all the choices, I believe the main disadvantage of buying fitness equipment is its maintenance. Indeed you will have privacy as you can do fitness exercises using that equipment indoors in your home; you will also flexibility because you can do fitness exercises whenever you want; you will also have a choice to workout when you choose, but if your equipment breaks, you will have to repair it or even buy a new one, which can be expensive as well as the cumbersome activity to do.
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