The correct option is D PHBV
Aliphatic polyesters are one of the important classes of biodegradable polymers. Some important examples are given below:
1. 2. Poly−β−hydroxybutyrate co−β−valerate (PHBV) is obtained by the copolymerization of 3-hydroxybutyric 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-Nylon 6 is an alternating polyamide copolymer of glycine (H2N−CH2−COOH) and aminocaproic acid [NH2(CH2)5COOH] and is biodegradable.
Nylon 6,6 and Nylon 6 are polyamide and hence not biodegradable polymer.