Conclusion:John plans to run at least six times a week this year, in order to increase the distance he runs per week by at least 50 percent.
Premise: Last year, John ran an average of four times per week. This year, to increase his speed and endurance, and thus improve his running time in a marathon, John is looking to increase the distance he runs per week by at least 50 percent.
Assumption: There are no problems with the plan. Running at least six times a week will result in at least a 50 percent increase in the distance John runs per week.
The question stem asks what is required for this year’s plan to achieve its aim, so this is an Assumption question. The argument uses a planning reasoning pattern, which can be identified because the passage contains a plan to run at least six times a week with a goal to increase the distance he runs per week by at least 50 percent.
The standard assumption of a planning reasoning pattern is that there are no problems with the plan. In other words, that the plan to run at least six times a week this year, will cause John to increase the distance he runs per week by at least 50 percent. Evaluate the answer choices, looking for one that matches this idea.
Choice A: No. A longer distance for each run is extreme language. It is only necessary that John run the same distance for each run on average in order for his total distance run to increase and thus allow the plan to work.
Choice B: No. This answer choice is out of scope. The mere risk of injury does not affect the number of times per week John will run, nor the distance he travels per week.
Choice C: No. Shorter distance is extreme language. Use the negation test. If The two additional runs per week will not be for a shorter distance than the average distance...per run last year, there is no problem with the plan. John will still be able to increase the distance he runs per week by at least 50 percent.
Choice D: No. Longest run is extreme language. Use the negation test. If John does not increase the distance he runs for his longest run each week by 50 percent, there is no problem with the plan. John will still be able to increase the distance he runs per week by at least 50 percent because the total distance he runs each week is dependent on all of his runs per week, not just the longest run.
Choice E: Correct. This choice is supported by the argument. Use the negation test. If The average distance per run...this year is not at least as long as the average distance...per run last year, then the plan will not work to increase the distance he runs per week by at least 50 percent.
The correct answer is choice E.