Bunuel
Betting on sports, even for small stakes among friends, is a form of gambling. Therefore, no police officer should ever bet on sports.
Which of the following, if true, most strengthens the conclusion that no police officer should ever bet on sports?
A. Gambling is illegal in many states and countries.
B. Some people who bet on sports are convicted criminals.
C. People who bet on sports sometimes can ill afford to lose the amounts they gamble.
D. No police officer should ever gamble.
E. Many philosophers consider gambling to be immoral.
OFFICIAL EXPLANATION
The conclusion of the passage is that no police officer should bet on sports. The premise is that betting on sports is a form of gambling. In order for this conclusion to follow logically from this premise, there must be an assumption identifying gambling as something that no police officer should ever do. The most effective way to strengthen the conclusion is to show that this assumption is true.
(A) This does not provide support for the conclusion that no police officer should ever bet on sports. Some police officers are in places where gambling is legal.
(B) The fact that some criminals bet on sports does not imply that police officers should not bet on sports. Some criminals brush their teeth, but it's still OK for a police officer to brush her teeth.
(C) This answer choice may provide a reason why some people should be cautious about betting more than they can afford to lose. It does not imply, however, that no police officer should ever bet even a penny on sports.
(D) CORRECT. This choice best strengthens the argument by making explicit the assumption upon which the conclusion is logically dependent.
(E) In order to get from this assumption to the conclusion that no police officer should ever gamble, one would have to assume that: (1) these philosophers are correct in their belief that gambling is immoral, and (2) no police officer should ever do something immoral. This would be assuming too much for a Critical Reasoning problem.