Identify the monomers of each biopolymer

We match each polymer in List I with its correct monomer in List II.

(A) Starch
Starch is a polysaccharide made up of $\alpha$-glucose units.
So, $A \to II$

(B) Cellulose
Cellulose is a polysaccharide made up of $\beta$-glucose units.
So, $B \to III$

(C) Nucleic acid
Nucleic acids (DNA/RNA) are polymers of nucleotides.
So, $C \to I$

(D) Protein
Proteins are polymers of $\alpha$-amino acids.
So, $D \to IV$

Final matching

$A-II,\; B-III,\; C-I,\; D-IV$

Compare with options

This corresponds to Option D.

Comparison with stored answer

Stored correct answer is D, which matches our derived answer.