The correct answer is option B
The antibiotics usually interfere within the process of transpeptidation. In transpeptidation, residues of amino acids or peptide are transferred from one compound to another and this is very important for the strengthening of the cell wall of the bacteria. Antibiotics like penicillin inhibit the process of transpeptidation by attacking the serine residue and thus the strength of cell wall reduces and it burst out thereby killing the bacteria.