Answer:
C. Three (3)
Step-by-step explanation:
Three nucleotides are required to code for a single amino acid. This is called the triplet code. The genetic code is a set of three-nucleotide sequences (codons) that correspond to the 20 amino acids found in proteins. Each codon codes for a specific amino acid, and the order of the codons in a gene determines the order of the amino acids in the protein that is produced.