Answer: The correct answer is- Genes are sections of DNA that program the amino acid sequences of proteins.
Gene can be described as a segment of DNA that codes for a particular protein.
They possess information for protein synthesis in the form of nucleotide sequences. Genes are first transcribed to form mRNA ( messenger RNA), which is then translated to produce a particular protein through assembly of various amino acids.
The amino are coded by codon ( sequence of three nucleotide such as AUG codes for methionine) present in mRNA.
Thus, last option is the right answer.