A. Genotype
Genotype of an organism refers to its genetic makeup. By genetic makeup, it is meant that the genes responsible for specific traits that are inheritable. Genes in an organism are often in alternate versions called ALLELES.
Two or more ALLELES make up a gene. Hence, all the alleles of an organism refers to that organisms GENOTYPE. According to this question, the specific combination of versions of genes (ALLELES) that an organism has inherited is a GENOTYPE.