Limited research indicates that therapeutic intervention before the onset of mental disorders can mitigate factors identified as major contributors to them. But a much more comprehensive research program is needed to verify these results and allow for the design of specific health care measures. Thus, in order to explore a potential means of cost-effectively helping people prone to mental disorders, we should increase funding for intervention research. Which one of the following, if true, most strengthens the argument? ['Once a mental disorder disappears, there is a fair chance that it will recur, given that complete cures are rare.', 'Most minor mental disorders are more expensive to treat than other minor health problems.', 'Prevention research can be coordinated by drawing together geneticists, neurologists, and behavioral scientists.', 'Reducing known risk factors for mental disorders is relatively inexpensive compared to the long-term treatment required.']