Premise:
This year, the percentage of accidents caused by drivers ignoring traffic lights has fallen.
Conclusion:
Therefore, the traffic police responded to inquests and took effective measures, leading to a decrease in preventable traffic safety issues.
Flaw:
The argument assumes that the decline in this specific type of accident is due to police action — without ruling out other explanations for the decline.
This is a causal flaw: correlation ≠ causation.
(A) Incorrect – Challenges data accuracy, but the argument is about trend over time, not classification error in a single year.
(B) Correct – Weakens the conclusion by suggesting the percentage of traffic-light accidents fell only because other accident types increased, not because fewer violations occurred.
(C) Incorrect – The argument doesn’t use inquests to count accidents, but to explain police motivation.
(D) Irrelevant – Doesn’t challenge the link between reduced traffic-light violations and police measures.
(E) Incorrect – Residents’ beliefs don’t affect the official cause data cited in the argument.
Option:(B)
It directly weakens the causal conclusion by showing the drop in percentage may result from an increase in other accidents, not from improved enforcement or police action.