The best and most correct answer among the choices provided by your question is the first choice or letter A which is "The study of the genomes of organisms."
Genomics is a discipline in genetics that applies recombinant DNA, DNA sequencing methods, and bioinformatics to sequence, assemble, and analyze the function and structure of genomes (the complete set of DNA within a single cell of an organism).
I hope my answer has come to your help. Thank you for posting your question here in Brainly.
