A sequence of dna that codes for a specific, detectable product, such as a protein or rna is called a gene and is therefore denoted as option B in this scenario.
This is referred as the basic unit of hereditary and is usually passed from the parent to the offspring. it also contains information which helps in the coding of certain substances such as protein.
The gene which comprises of DNA which is referred to as deoxyribonucleic acid ensures that certain types of traits are passed to the offspring thereby resulting in genetic variation. This is a function of the type of cell division known as meiosis which gives rise to four unique daughter cells.
This is therefore the reason why gene was chosen as the most appropriate choice.
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