This is a keloid. In normal wound healing type 3 collagen is first synthesized and then degraded by Matrix metalloproteinase (a collagenase which uses Zinc as a cofactor) and replaced by Type 1. In a Keloid an excessive amount of disorganized Type 3 collagen persists. Therefore the defect is in Collagen synthesis (Type 1 synthesis)
Imo, this answer choice is wrong, there is no problem in the process of collagen "synthesis" per se. The issue is with excessive synthesis and disorganized deposition. Not an 'abnormal synthetic process' - as would be in EDS, MF, Menkes, etc.
Sounds like a hypertrophic scar. "Hypertrophic scars contain primarily type III collagen oriented parallel to the epidermal surface with abundant nodules containing myofibroblasts, large extracellular collagen filaments and plentiful acidic mucopolysaccharides." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3022978/