From what I would think, it is D.
When the phosphate groups of the single nucleotides combine to form the backbone of the nucleic acid, energy is released. This energy is used for polymerization.
Answer:
It will be C.
Explanation: If you read all of the other choices closely they don't make sense in context. (Option A) wouldn't make sense because removing things that could be reused would be inefficient to the body (and waste can't typically be reused in the human body). (Option B) growing too tall isn't particularly healthy or helpful, but it's not exactly life threatening either. And the very last choice is just nonsense period.
Answer:
Exactly 18.228749999999973 grams :)
I recommend rounding to 1 d.p