Critical Reasoning (CR) | Re: One theory about the people who lived on Easter Island is that their p

What is the source of these questions that you are posting?

Conclusion: That theory must be incorrect

Based on the premise that sharpened stones were not weapons. That is, no proof has been found that they were at war with each other.

A. proceeds as if the lack of evidence that factions of the people on Easter Island warred among themselves proves that they did not.

Hence (A) works.