Passage Summary: Early weapons weren't very deadly, but archaeologists found many more warrior graves from a later period, leading them to believe the tribes developed more lethal ways to fight.

Conclusion: By the late Bronze Age, tribes had invented new fighting techniques specifically intended to increase the number of deaths in war.

Reasoning: While early Bronze Age weapons were too clunky to cause many deaths, recent excavations of later settlements show a much higher number of warrior tombs.

Analysis: The archaeologists are inferring a change in 'methods' based solely on an increase in 'tombs.' To strengthen this, we need to bolster the link between the number of graves and the actual intent or effectiveness of warfare. We should look for an answer that rules out other reasons for the increase in tombs, such as a general population explosion or a change in how soldiers were buried. If we can confirm that the injuries found on the bodies match new types of weapons, the argument becomes much more persuasive.