Can someone me with this question and explain why that answer is right?

The order of the codons differs between organisms.

Explanation:

Genetic code may be defined as the triplet codon of the nucleotide that codes for the particular amino acids in the organisms. Hargobind Khurana gave important contribution in the genetic codes.

The genetic code is degenerative in nature means the single amino acids are coded by more than one codon. The arrangement of the codons determines the type of amino acids and these codons are universal in nature with few exception. The organisms show variation because order of the codon are different that read in the different fashions in the organisms.

Thus, the correct answer is option (A).