Answer: The correct answer is Option A.
Step-by-step explanation:
Nucleic acids are the biopolymers which are essential to all the life forms. They are present in both RNA and DNA.
These are composed of nucleotide which are the monomers and is formed from three parts, they are 5-carbon sugar, a phosphate group and a nitrogenous base.
Nucleotides are joined together to form a long chain is known as Nucleic acids.
DNA has a double helix structure and RNA has a single stranded structure.
Therefore, the correct answer is Option A.