Which of the Following Is Most Likely to Produce Further

Which of the following is most likely to produce further increases in life expectancy in the U.S., according to Manton at Duke University?

A) alteration of aging at the molecular level
B) eliminating cancer, heart disease, and other major killer illnesses
C) reaching a near zero population birth rate
D) low-risk lifestyles that exclude smoking, alcohol, and high cholesterol foods