Considering you did not post the options, I'd go with The Maze Runner.
Answer:
food production became more difficult
Explanation:
How to implement the agreement at Yalta was the purpose of Potsdam and tensions between Russia and the U.S. grew between both nations; Truman was now president of the U.S.and was disturbed by Stalin's movement into eastern European nations before WW II's end.
He wrote the set of 27 laws to keep the kingdom steady
