Answer :
The conquering of the Kingdom of the Two Sicilies by Giuseppe Garibaldi's Redshirts was an important event that led to unification of Italy.
What is the unification of Italy?
This involved a social movement that seeks to consolidates the different states of the Italian Peninsula into a single state which was called the Kingdom of Italy.
Hence, the event that played an important role in the unification is the conquering of the Kingdom of the Two Sicilies by Giuseppe Garibaldi's Redshirts.
Therefore, the Option B is correct.
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