Which statement is true about population increase ______
A.There might be an increase of 2.2 billion persons from now to the year 2000.
B.About 50,000 babies are born every six hours at present.
C.Between 8,000 B.C. and the present, the population increase is about 80,000,000 persons each year.
D.The population increased faster between 8,000 B.C. and 1650 than between 1650 and the present.