It was that "Flat land with poor drainage led to salinization from irrigation waters," that was a factor in the decline of Sumer, since this led to a build up of salt in the soil, which greatly reduced agricultural output.
I think one is good but I'm not sure
...As a response to the Protestant Reformation, the Catholic Church began a program to enact reform from within. The purpose of the Counter/Catholic Reformation was to end corruption, return to traditional teachings, and to strengthen the church in an attempt to stop its members from converting.<span>SO your answer is B</span>