As the picture shows, it is the statistical chart of six population censuses in China. Read the chart and answer the question 10- 12. The chart shows that the period of the fastest population growth i

As the picture shows, it is the statistical chart of six population censuses in China. Read the chart and answer the question 10- 12. The chart shows that the period of the fastest population growth in China is () a. After the founding of People's Republic of China (PRC), due to the improvement of people's living standards and medical and health conditions, the population mortality rate dropped sharply, and the population of China increased rapidly. For example, the population grew fastest in the 1960s and 1970s. Since China vigorously promoted the family planning policy after 1970s, the momentum of excessive population growth has been effectively curbed, and the population growth rate has gradually declined. Especially in the last decade, the birth rate and natural growth rate have dropped significantly.

Therefore, choose: B.