It was primarily "a. Baron de Montesquieu" who James Madison borrowed the idea of separation of powers from, since this idea was one of Montesquieu's main ways of ensuring that tyrannical governments did not form.
Guiseppe Garibaldi and Count Camillio Di Cavour were both associated with the Unification of Italy.
In 1861 the Italian states were unified as the Italian kingdom and these two men made it possible. The main reason for their success was that Cavour had the political power and Garibaldi the popular support.
The spanish gov't favored the peninsulares over the creoles, often rewarding them with powerful gov't positions.
I believe it is A They did not want Texas to be admitted to the union as a slave state.