Critical Reasoning (CR) | For every 40 cats that contract a particular ear infection

As per my understanding the author has assumed that in a year their will be atleast 1000 incident because of this infection in cat so he concluded on the basis of this that the probablity of death in 1000 will be less than in 40 so it is safer for a cat to get vaccinated

As we know that in argument evaluation question we have to consider that option which both strenghten and weaken the argument or conclusion
if their are 1000 incident in a year and all of the cat get vaccinated then its strenghten
...

---