Passage Summary: More people in Australia are old enough to drive now than five years ago, but fewer people are dying in car crashes, so the author concludes that Australians must be better drivers than they used to be.

Conclusion: The current driving-age population in Australia is more skillful at driving than the population was five years ago.

Reasoning: Despite an increase in the number of people of driving age over the last five years, the annual number of traffic fatalities has decreased.

Analysis: The author is making a classic leap by assuming that a drop in fatalities must be caused by an increase in driver skill. To weaken this argument, we need to find alternative explanations for why deaths decreased even as the potential driving population grew. Perhaps cars have become significantly safer, or maybe medical trauma care has improved so much that people survive crashes that used to be fatal. Since this is a 'Weaken EXCEPT' question, look for the one answer choice that fails to provide an alternative cause or actually supports the idea that drivers are getting better.