Bunuel
Ronald is a runner on the track team and is a great hurdler. All runners on the track team are either sprinters or long distance runners, but a few long distance runners do not run the sprint because they are not fast enough. Hurdlers never run long distance because they lack the endurance necessary. Therefore, Ronald must be fast.
For the conclusion drawn above to be logically correct, which of the following must be true?
A. Sprinters are faster than hurdlers.
B. All runners on the track team who run hurdles also run long distance.
C. Hurdling requires more endurance than running long distance.
D. All sprinters are fast.
E. Every runner on the track team who is fast is a sprinter.
KAPLAN OFFICIAL EXPLANATION:
D
Conclusion: Ronald must be fast.
Evidence: We are given that Ronald is a hurdler, and that all the runners on the track team are either sprinters or long distance runners, but no hurdlers are long distance runners. Therefore Ronald, a hurdler, must also be a sprinter. For the conclusion to be logically correct, (D) must be true because if Ronald is a sprinter, and all sprinters are fast, then Ronald must be fast.
(A) makes no sense because the argument states that all hurdlers are sprinters; (B), (C), and (E) directly contradict statements made in the argument.