Can nucleic acid,protein and starch be considered as step growth polymers?

(A) Yes,nucleic acids,proteins,and starch can be considered as step-growth polymers.
During their polymerization process,the formation of these biopolymers involves the elimination of small molecules like water $(H_2O)$ or other neutral molecules.
Since they are formed by the condensation of monomers with the loss of small molecules,they are also classified as condensation polymers.