The 20th century has witnessed a remarkable increase in the population of the world and specially so in India. One major factor for this is that [DPMT 1986]
A) Older people have began to live longer
B) More children are born in each family
C) More children per family have began to reach the reproductive age
D) More people are marrying in younger age group
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the answer to your question is A
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Older people have began to live longer
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