Passage Summary: Archaeologists found a tiny stone head with an open mouth. They don't think it's a weapon because it's so small, so they assume it was used to signal whose turn it was to talk in a group.

Conclusion: The carved flint object found in the Stone Age tomb was likely the head of a communal speaking staff.

Reasoning: The object is too small to be a mace head, and its open-mouth design is a symbol for speaking.

Analysis: The argument relies on ruling out one possibility (a weapon) to favor another (a speaking staff). To weaken this, we should look for an answer that either makes the 'weapon' theory more plausible or provides a third, more likely alternative. Perhaps the object wasn't a functional tool at all, or maybe its small size didn't prevent it from being a weapon. Look for information that suggests the 'open mouth' symbol or the object's size is consistent with something other than a speaking staff.