From 1990 to 2019, China experienced significant development in its economy, health, and education. In 1990, China's life expectancy was 69.1 years, its average number of years in school was 4.8, and its GNI per capita was equivalent to $1,469. In 2019, China's life expectancy was 76.9 years, its average number of years in school was 8.1, and its GNI per capita was equivalent to $16,057. Which factor has most likely played the biggest role in these improvements? Responses large investments in the private health care system increased use of more efficient farming methods initiatives to encourage enrollment in higher education opening up its economy to global trade greater political participation by women