A is the answer i hope you're okay with it
It was that "C. Some Christians lost respect for Catholic leaders who engaged in political power struggles" that was a major contributor to the Protestant Reformation, since the Reformation was the first major successful challenge to the authority of the Catholic Church.
It helps us better understand the choices of the people before us. If we don't learn about its history then the lives lost fighting would be worthless.
The German invasion of Poland lead to World War II because Britain and France had guaranteed Poland's border and declared war.
The answer is A. vaporization