Mostly to keep them from getting sick or getting any infections because what ever sickness other animals might have its best to give injections to keep them from getting what ever the other animal has. And sometimes it might also be to improve health,
control disease or increase productivity. If they give it an injection it might be for a paracitic reason to.
The last one sounds like a good choice
D)Sal should asses the risks, try to reduce them, and make the change
A is your answer because if you have vision problems at such a young age,you can experience delay in language learning visually.
