I believe your answer would be:
A. Fossils.
Explanation:
Because they are the preserved remains or traces of animals, plants, and other organisms from the past. They're also important evidence for evolution because they show that life on earth was once different from life found on earth today.
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For building protein the first step should be DNA that makes how protein should be so the answer is C :))
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That is because being prokaryotic or eukaryotic doesn't depend on the size of the organism, but rather on the cellular structure. Both are eukaryotic because they have clearly defined nuclei and functioning organelles that are differentiated, unlike prokaryotic organisms.