Decades of "one child" policy, a declining rate, and an increase in life expectancy lead to them having fewer young people.
The correct answers are B) Epidemics and D) Warfare.
The factors that slowed population growth in China until the 1300s were epidemics and warfare.
China’s population had a growing tendency until the 1300s when a couple of factors reverse the tendency. One of them was epidemics. In those years epidemics made thousands of people died. There were no effective medicines to cure the epidemy and the government did not have any measures to control the spread of the epidemics. The other important factor was war. The war in those years increased the mortality. Many lives were lost in China and natality diminished also. So it is true that The factors that slowed population growth in China until the 1300s were epidemics and warfare.