PT 20 S4 Q7

For every 50 dogs that contract a certain disease, one will die from it. ... ...

Which one of the following would it be most helpful to know in order to evaluate the argument?
(A) the total number of dogs that die each year from all causes taken together
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 2 - "Evaluation" Subset