Passage Summary: Scientists found old wooden spears and horse bones in a place where modern humans hadn't arrived yet, leading them to believe that earlier human-like species were actually hunting those horses.

Conclusion: The discovery of ancient tools and horse remains proves that early human relatives were hunters rather than just scavengers.

Reasoning: Archaeologists found 400,000-year-old sharpened poles and cutting tools alongside horse bones in a region where modern humans had not yet arrived.

Analysis: The argument assumes that the mere presence of poles and horse bones together automatically equals hunting. To strengthen this, we need to rule out other ways these items could have ended up together or confirm the poles were actually used as weapons. Look for an answer that suggests the horses didn't die of natural causes or that the poles show clear signs of being used for killing. Strengthening the link between the tools and the act of killing is the priority here.