A) 50
B) 100
C) 150
D) 200
Correct Answer: B
Solution :
Population of the world increased from 1 billion in 1830 to 2 billion in 1930. It took a long time of 100 years for world population to increase from 1 billion to 2 billion due to high rate of mortality. In contrast it took only 12 years for the world population to increase from 6 billion in 1999 to 7 billion in 2011.
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