Explanation:

Both statements 2&3 are correct.

• It's been published by the Population Division of the United Nations in a biennial cycle since 1951 and not by the World Economic Forum.
• The report projected that India would surpass China as the world’s most populous country in 2023.
• According to the report, India’s growth rate stood at 2.3 % in 1972, which has dropped down to less than 1% now.
• In this period, the number of children each Indian woman has during her lifetime has come down from about 5.4 to less than 2.1 now.
• This means that India has attained the Replacement Fertility Rate, at which a population exactly replaces itself from one generation to the next. 

Hence option 2nd is correct.