I think it’s will be A but not sure
<span>The crust (sedimentary/igneous/metamorphic rocks), the mantle (oxygen, silicon, magnesium, iron) , inner core (solid iron and nickel) and outer core (liquid iron and nickel). </span>
Monomer of nucleic acid is Nucleotide.
Nucleotide is made up of three components namely- Nitrogenous base, pentose suger and phosphate group.
Depending upon the nucleic acid,i.e RNA or DNA, nucleotide can be Ribonucleoside triphosphate (rNTP) and deoxyribonucleoside triphosphate repectively (dNTP).