The correct option is C Condensation polymerisation
Condensation polymers are kind of polymers formed through condensation reaction, where molecule join together-loosing small molecules as byproducts such as water (H2O).
Preparation of nylon from hexamethylene diamine and adipic acid follows as
nCOOH−(CH2)4−COOHadipic acid+nNH2−(CH2)6−NH2hexamethylene diamine ↓−nH2O Nylon 6,6
Hence, preparation of nylon is an example of condensation polymerisation.