Which statement best describes the components of nucleic acids?
they are made up of chains of amino acids.
they are made up of carbon, hydrogen, and oxygen only.
they are made up almost entirely of carbon and hydrogen.
they are made up of nitrogen bases, sugars, and phosphates

The questions asks, 'which statement best describes the components of nucleic acid. The correct option is D. Nucleic acid is a complex organic substance present in DNA and RNA. Nucleic acid molecules are made up of long chain nucleotides whose basic components are nitrogenous bases, sugars and phosphates.

The statement that best describes nuclei acid is; they are made up of nitrogen bases, sugars ,and phosphates. 

Explanation; 
Nucleic acids are molecules that make up the genetic information in living organisms, they allow them to transfer genetic information from one generation to another. There are two major types of nucleic acids, namely DNA and RNA; each contains nitrogenous bases, sugar, and phosphates.
DNA contains, the bases (thyamine, cytosine, guanine, and Adenine), deoxyribose sugar, and phosphate.
RNA contains; the bases (uracil, adenine, cytosine, guanine), ribose sugar and phosphate. 

The answer is a because - is an direction