Vaccination Is Best Described as Prevention of Severe Disease by _______

Vaccination is best described as prevention of severe disease by _______.

A) the deliberate introduction of a virulent strain of an infectious agent
B) prior exposure to an infectious agent in an attenuated or weakened form
C) prophylactic treatment with antibiotics
D) stimulating effective innate immune responses
E) using effective public-health isolation regimens such as quarantine.