Question

How does a vaccine work?

a. it kills viruses.
b. it protects cells from viral infection.
c. it prepares the immune system to recognize viruses.
d. it prevents viruses from being transmitted from an infected person.

Answer 1

C is the answer
it's like they put a little in you so that it won't hurt you, but your immune system is getting 'trained' to fight it if it ever sees it again