Passage Summary: Scientists noticed electric signals before big quakes, so they think they can use these signals to tell people when to run for cover.

Conclusion: The new prediction method will effectively assist officials in determining when to evacuate towns.

Reasoning: Changes in the earth's electric current were observed before every major earthquake in the region over the last decade.

Analysis: The argument assumes that because these signals preceded every earthquake, they are reliable indicators. However, it fails to consider 'false positives.' If these electric changes happen frequently without being followed by an earthquake, the prediction method would be useless for evacuations. Look for an answer that suggests the signal is not unique to seismic activity.