(D) The world population grew rapidly during the $20^{th}$ century. According to demographic data,the global population reached approximately $6$ bill

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(D) The world population grew rapidly during the $20^{th}$ century. According to demographic data,the global population reached approximately $6$ billion $(6 \times 10^9)$ by the year $2000$,which marks the end of the $20^{th}$ century. Therefore,the correct option is $D$.