Robert: Speed limits on residential streets in Crownsbury are routinely ignored by drivers. People crossing those streets are endangered by speeding drivers, yet the city does not have enough police officers to patrol every street. So the city should install presence on residential streets to slow down traffic.
Sheila: That is a bad idea. People who are driving too fast can easily lose control of their hit a speed bump.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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