Question

for europe, the most positive result of the congress of vienna was that
○ the balance of power was restored
○ napoleon would never again take power
○ european countries formed an economic alliance
○ european countries would now work together

Explanation:

The Congress of Vienna's core goal after Napoleon's wars was to prevent future large-scale European conflicts by re-establishing a balance of power among major European nations, which was its most impactful positive outcome. Napoleon's return (Hundred Days) showed the second option was not initially guaranteed; no economic alliance was formed; and while cooperation was discussed, the restored balance of power was the concrete, defining positive result.

Answer:

the balance of power was restored