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 aimed to re - establish the balance of power in Europe after the Napoleonic Wars. While Napoleon's final defeat (at Waterloo, after the initial Vienna Congress arrangements) meant he wouldn't take power, the key positive and intended result was the restoration of the balance of power. European countries didn't form a broad economic alliance at this time, and the idea of them "now working together" wasn't the primary positive outcome as the focus was on power balance.

Answer:

A. the balance of power was restored.