The correct sentence is A.
They both evolves around acting
The world population increased throughout 1950 to 2000 after the industrial revolution and wars. The population in 1950 started as 6.9 billion people. In 2000 the population grew to be 9.6 billion people. After the wars people were happy to see their family’s and started growing their family bigger. During this period of time the population rapidly increased.
It's fine, we all make mistakes.
