Final answer:
The germ theory of disease states that contagious diseases are caused by microorganisms that grow and reproduce in their hosts. Louis Pasteur and Robert Koch are the major contributors to this theory. Hence the correct answer is option C
Step-by-step explanation:
The germ theory of disease is the theory that contagious diseases are caused by the transmission of microorganisms that grow and reproduce in their hosts and make them sick. The two major contributors to this theory are Louis Pasteur and Robert Koch.
Example: When a person is infected with a bacteria or virus, these microorganisms invade their body and can cause illness.
Hence the correct answer is option C