Base is the chemical that a DNA segment codes for. A is the best choice.
<h3> what is a base ?</h3>
The biological substances known as nucleobases, commonly referred to as nitrogenous bases or simply bases, contain nitrogen and combine to produce nucleosides, which are subsequently parts of nucleotides, which are the fundamental constituents of nucleic acids.
The entire query is attached.
The base is the chemical that a DNA segment codes for.
Therefore, choice A is the best one.
For more details regarding nitrogenous bases, visit:
brainly.com/question/14090794
#SPJ1