Previously, demographers predicted the U.S. population would level off between 290 and 300 million. However, they now estimate it will stabilize near 390 million due to which of the following reasons?

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a substantial rise in the birth rate during the early 21st centurya near-century increase in average life expectancy at birthcontinued high levels of immigrationall of these factors combinednone of the above

Explanation

The updated population projections are based on multiple factors: an increase in birth rates, improvements in life expectancy approaching 100 years, and sustained high immigration rates. Together, these contribute to the higher estimated population stabilization.