A city council is debating a proposal to convert a disused railway line into a linear park. Proponents argue it would increase green space, encourage walking and cycling, and boost property values in adjacent neighborhoods. Opponents express concerns about increased traffic congestion from visitors, potential for crime, and the cost of maintenance. A recent independent study, commissioned by the city, analyzed similar 'rail-to-trail' projects in other cities. The study found that while property values did increase by an average of 5-10% within a quarter-mile radius, there was no statistically significant increase in crime rates or traffic congestion directly attributable to the parks. Maintenance costs, however, often exceeded initial projections by 15-20% in the first five years. Which of the following statements best describes the overall impact of the independent study's findings on the city council's debate?

1. AIt primarily strengthens the opponents' arguments by highlighting unforeseen negative consequences.
2. BIt entirely validates the proponents' arguments and refutes the opponents' concerns.
3. CIt supports some of the proponents' claims while partially alleviating and partially confirming opponents' concerns.
4. DIt weakens both the proponents' and opponents' arguments equally, suggesting the project is too risky.