Answer:
D.) All of the above.
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It should come as no surprise to anyone that your physical state will be ever-changing throughout your life. And again, totally unsurprisingly that your body will be influenced by many factors as your body is highly complex and depends on a plethora of biological things each day. And it is for that exact reason, for why you are so absolutely biologically sophisticated that many things will be specific and exact to you and you alone.
Have a great day!