Cannot Be True—SN. The correct answer choice is (A)
This stimulus provides several conditional statements:
If one has the ability to fully concentrate, one is above average intelligence:
- Ability to fully concentrate above average intelligence
Also, getting successfully trained in speed reading is usually accompanied by an increased ability to concentrate (notice that this vague increase does not equate to the ability to “fully” concentrate).
- Successful speed reading usually increased ability to concentrate
The question stem tells us that all of the answer choices could be true except one. Thus, the correct answer choice will be the one that cannot be true.
Only correct answer choice (A) is precluded based on the conditional statements above. Since we know from the stimulus’ first conditional statement that everyone who can fully concentrate is above average intelligence, there can’t be anyone who can fully concentrate who is below average intelligence. None of the other answer choices are contrary to the sufficient-necessary statements above.