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The universalgenetic codeof DNA is common to virtually all organisms on Earth it is because all living things share a common genetic language of DNA because they share a common ancestry. ThusOption Aiscorrect.what is genetic code?Genetic coderefers to the instructions inDNAof our body is convertedcodonfound in mRNA, finally in protein.All genes codes for four types ofnucleotide basessuch as adenine (A), cytosine (C), guanine (G) and thymine (T).These are represented in three letter word calledcodonwhich specify oneamino acid, basic unit ofprotein.The genetic code is important as it produce the products which is necessary for the survival and the information can be passed to next generation.It is arbitrary due to the fact that all organisms share a singlegenetic codeis due to their common ancestor. Hence,Option Aiscorrect.Learn more aboutgenetic code, here:brainly.com/question/17306054#SPJ6...