Unsupported. If the city hadn’t invested in computer modeling technology, then the financial predicament wouldn’t have been resolved. But the stimulus doesn't say anything about which software the company needed to choose; a competing software might have worked just as well.

Very strongly supported. By chaining the conditional claims, we see that if the city hadn’t invested in computer modeling technology, then rush-hour traffic flow wouldn’t have increased, and the financial predicament wouldn’t have been resolved.

Unsupported. Just because rush-hour traffic flow increased doesn’t mean that overall traffic increased. There could be the same amount of traffic crossing the bridge this year, just more traffic flow at rush-hour.

Unsupported. Rush-hour traffic flow wouldn’t have increased if the city hadn’t invested in computer modeling technology. But just because the city invested in this technology doesn’t mean that it was their highest budgetary priority last year.

Unsupported. We don’t know why the mayor supported investing in computer modeling technology. It did increase rush-hour traffic flow, but the mayor might’ve had other reasons for supporting it.