A. Enzymes
B. Blood types
C. Genes
D. Hormones
Genes are used in techniques like DNA sequencing to determine a person's DNA sequence. DNA sequencing involves determining the order of nucleotides (A, T, C, and G) in a DNA molecule. Genes are used to replicate and amplify DNA segments, allowing researchers to analyze the sequence of nucleotides present in a person's DNA
Therefore, the Correct Answer is C.