Which statement best explains why someone who has received the flu vaccine can still get the flu?
a
The flu vaccine was not a close enough match to the flu virus that was circulating in the community to protect against it.
b
The flu vaccine was too similar to the flu virus that was circulating in the community to protect against it.
c
The flu vaccine helped the flu virus to strengthen inside the person's body.
d
The flu vaccine helped the flu virus to spread inside the person's body.
a
The flu vaccine was not a close enough match to the flu virus that was circulating in the community to protect against it.