I go for D.
In E, even we know the number of infected cats, there is no use in it.
For example, if there are 1000 infected cats. Number of cats die is 1000/40 = 25.
After vaccination, one in 1000 will die. This is already stated in passage. It shows that number of cats dies will reduce, but doesn't give information that it is safer.
In D, We know that one in 1000 will die. If we even know the likelihood of cats contract another infection after vaccination, we can conclude that it is safe to
...
In E, even we know the number of infected cats, there is no use in it.
For example, if there are 1000 infected cats. Number of cats die is 1000/40 = 25.
After vaccination, one in 1000 will die. This is already stated in passage. It shows that number of cats dies will reduce, but doesn't give information that it is safer.
In D, We know that one in 1000 will die. If we even know the likelihood of cats contract another infection after vaccination, we can conclude that it is safe to
...
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