Explanation:
They are called pathogens, due to which many types of diseases are born. It contains viruses, bacteria, fungi, parasites, etc. It can make sick any organism, plant or other micro organisms. Diseases caused by organisms in humans are also known as pathogenic diseases. Bacteria is a prokaryotic organism and biodegradable while DDT is a nonbiodegradable pollutant and undergo biological magnification.Hence, the correct option is (B).