The correct answer is C. dominant.
There are two copies of the gene present in each chromosome set. But the action of certain genes dominant over the action of the other gene present in the same locus of the chromosome and is referred to as allele. Alleles are different versions of the same gene. The one which is expressed is the dominant and the other which is not expressed is the recessive allele. The phenotype is a result of the dominant allele of the gene expressing itself.