Vaccines contain microbes (or parts of them) that can normally cause disease. These microbes are weakened so that, instead of causing disease, they help prepare the body to fight against future invasions by the same types of microbes.

How do vaccines prepare the body to fight these future invasions?
A.
They grow stronger in the body and multiply.
B.
They cause the excretory system to release all viruses as waste.
C.
They stimulate the immune system to create antibodies.
D.
They mutate within the body and kill off other invaders.