The instructions for the genetic traits of an organism are directly determined by the a-numbers of a, t,c and g units in a sugar molecule b-sequence of the bases in dna molecules c-length of a dna molecules d-way the bases are paired in the two strands of a dna molecule

The Genotypes of the organism are different in each organism. These genotypes help in studying the pedigree of the organism for several generations.

The different genotypes are:-  

These two different types of genotypes help to study the pattern of inheritance of the genes in a period of time and to the next generation.

The sequence of the DNA codes for the enzyme protein and other biomolecules.

Hence, The correct option is B) which is a sequence of the bases in DNA molecules.

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The answer would be:

B. Sequence of the bases in DNA molecules.

Here is more about your questions:

DNA contain the instructions of the traits of an organism. Most of the organism have the same DNA but what makes each different is the sequence of the DNA. The sequence gives the instructions for the production of amino acid that will produce, which in turn determines what traits will be passed on or manifested by that individual.