Understanding the argument -
Until recently it was believed that weight training did not help children but in fact did harm and possibly stunted their growth. - General view.
A new study has determined that weight training among children between ages 6 and 18 helped them grow stronger even though they did not gain muscle mass like adults. - Premise.
Therefore, our government should require weight training for all children in public schools who are between the ages of 6 and 18. - Conclusion. So, what's the end objective/goal of this mandate? So the children can grow stronger. What will weaken it? If somehow we can know that even after this mandate the end result is not achieved? Yes. that would weaken the efficacy of the proposed plan.
Which one of the following statements, if true, most seriously weakens the argument?
(A) The school year is only nine months of the year, and with children, weight training must be done on a consistent basis all year round. A home-based program is required for success. - Means that home training is the necessary condition. So, just mandating it in schools will not help achieve the end goal, which is the children can grow stronger.
(B) Since the children do not gain muscle mass, measuring their progress will be difficult without the specialized instruments used in the study. - measuring their progress is out of scope.
(C) The study was performed with subjects from only one geographic location where weight training is more culturally acceptable. - But it could still be beneficial. It tries to play on the sampling bias but fails to address the main issue.
(D) The gain in strength over a nine-month school year will be minimal. It takes at least a year for the children to show significant results from
weight training. - Even if minimal, if they do over the years, they can still benefit.
(E) Children do not respond positively to government requirements and low morale may adversely affect results of any government-instituted weight training requirements. - how children respond is out of scope. Even if children resist and they also resist studying, but studying could still be beneficial. Isn't it?