Which of the following monomers form biodegradable polymers?

Correct options are A) and C)

Poly-β−hydroxybutyrate co-β− valerate (PHBV). It is obtained by the copolymerization of 3−hydroxybutanoic acid and 3−hydroxypentanoic acid. PHBV is used in specially packaging orthopedic devices and in controlled release of drugs. PHBV undergoes bacterial degradation in the environment.
Nylon−2−. It is an alternating polyamide copolymer of glycine (H₂​N−CH_2​−COOH) and aminocaproic acid [NH₂​(CH₂​)₅​COOH] and is biodegradable.