Answer:
Option C, DNA
Step-by-step explanation:
All the physical characteristics and traits of organisms are related to the alleles present on any gene.
Some alleles are dominant and hence they express their characteristics while some are recessive allele which may be present in a gene but do not expresses their traits.
While some time traits are either expressed co-dominantly or independently. DNA carries these genes and hence it plays an essential role in determining the look and way of development of an individual
Hence, option C is correct