Ans. (A). genome chromosome DNA molecule gene.
The genetic material of eukaryotic organisms is packaged into the chromosomes, which are found in nucleus.
The genome represents the broadest level of DNA organization. It can be defined as the sum total of genetic material present in an organism. It is made up of all the chromosomes present in the cells.
The chromosomes are deoxyribonucleic acid molecules and each chromosome made up of a linear DNA molecule along with histone proteins.
The DNA molecule represents genetic material, composed of two helices that coil around a imaginary axis to form double helix. It has several genes that carry information for all cellular activities.
The genes represent most specific category of DNA organization. Genes can be defined as a segment of DNA with a function that can form a function molecule (either RNA or protein).
Thus, the correct answer is option (A).