Answer:
b. killing pathogenic agents with a chemical made for that purpose.
Step-by-step explanation:
Disinfection is usually carried out to kill microbial disease causing organisms. Disinfection involves using specialized chemical to kill these organisms. The substance use for disinfection is known as disinfectants. Disinfectants kills germs and infectious organisms, disinfectant are mostly used in the hospitals, kitchen, tooth surgery etc.
Pathogens are microbes that can cause disease to the body. Using disinfectants kills these pathogens . The disinfectant are usually specialized chemical for the purpose of eliminating pathogenic agents like viruses and fungi.