Why did the settlers of Texas prefer a federalist form of government to a
Centralist government?

The Federalist form of government was similar to the one in the US, which the Texans liked a lot. It also provided more rights for Texas as a state.

I believe the correct answer from the choices listed above is option B.  Euros felt that they were the top of the human species because they were the most "civilized." They had guns, they had steel and they weren't afraid of using them to get gold, silver, silk, timber, and other riches that were found in other people's lands. This would make them Darwin's 'fittest to survive and thrive." 

Hope this answers the question. Have a nice day.