Answer:
C or choice 3.
Explanation:
1 is subjective, as this is an opinion. 2 may be true however it is not backed up with any evidence and could be construed as an opinion. 4 is probably true but only the writer has that perspective about the dogs in their neighborhood.
3 had research statistics to show facts. It would be even clearer if the writer stated where the research came from.
C because you have to put a comma in between the city and state but not after the state
During Mao Zedong’s regime, urban income and life expectancy increased. As a result, there was an increase in China’s population. To overcome this problem, China established the one-child policy in 1979.