Answer: B). Bacteria
Bacteria are prokaryotic organisms. These have cell walls that contains peptidoglycan which establishes a structural framework of bacterial cell walls. The peptidoglycan is sensitive to traditional antibacterial antibiotic. As, these antibiotics are derived from bacterial strain which is more competent in nature against the infecting bacteria. Therefore, these antibiotics firstly degrade the cell walls of bacteria by degrading polymer chain consist of sugar and aminoacids present in peptidoglycan.