A city planner is evaluating the effectiveness of a new public transportation initiative aimed at reducing downtown traffic congestion. The initiative involved increasing bus frequency on existing routes and introducing a new ride-sharing service subsidized by the city. After six months, a report shows that bus ridership increased by 15%, and the ride-sharing service saw 10,000 unique users. However, downtown traffic congestion has only decreased by 2%, and parking garage occupancy has remained unchanged. Which of the following inferences is most strongly supported by the report's findings?

1. AThe public transportation initiative successfully eliminated downtown traffic congestion.
2. BMost new public transit users previously drove their private vehicles downtown.
3. CThe ride-sharing service was more effective at reducing congestion than increased bus frequency.
4. DThe increased public transit use did not significantly alleviate downtown traffic congestion.