PT33.S3.Q04 - limited research indicates

skdygks03

Hello I have a question regarding the method of identifying an assumption. This is a strengthening question.

Context: Therapeutic intervention before the occurrence of mental disorders can mitigate factors known as major contributor to them.
Premise: A much more comprehensive research program is necessary to verify these results and allow for the design of specific health care measures.
Conclusion: In order to explore a potential means of cost-effectively helping people prone to mental disorders, we should increase funding for intervention research.

In order to find an assumption, I tried to see the gap between the premise and conclusion and found one gap that increase in funding for the research could lead to a much more comprehensive research program. With this in mind, I went to AC. But I could not find an answer that matches the assumption I drew. In the second shot of POE, through (C) I found that the author is assuming that by saying that the intervention research is cost effective the author is making an assumption that the research program is inexpensive compared to long-term treatment.

My question is, how come do I find the assumption that the right answer actually requires if that assumption cannot be drawn from the gap between the premise and the conclusion? Here, the claim that the research program is cost-effective seems to have nothing to do with the premise.

This question is part of CC.
https://7sage.com/lsat_explanations/lsat-33-section-3-question-04/

Thank you.