Passage Summary: The city fixed its money problems by getting more cars across a bridge. This only happened because the mayor asked for computer modeling, which allowed engineers to improve the bridge's capacity.

Reasoning: The city's financial recovery depended on increased bridge traffic, which was only possible because of computer modeling requested by the mayor.

Analysis: This is a classic 'Must be True' chain of conditional logic. We are looking for a deduction that links these facts together, such as the idea that the mayor's request for modeling was a necessary step in solving the city's financial crisis. Focus on the 'if not A, then not B' structure to find a valid inference. The correct answer will likely bridge the gap between the mayor's initial request and the final financial resolution.