Arrange the following characteristics of low-income countries in the correct order from most to least impactful on their economic development: A) Limited access to healthcare, B) High levels of child labor, C) Low Gross National Income, D) Limited access to education.

When we look at the characteristics of low-income countries and how they affect economic development, we can see that low Gross National Income (GNI) is the most impactful factor. A low GNI means that the country has less money overall, which limits its ability to invest in important areas like healthcare and education. Limited access to education comes next because without education, people cannot gain the skills needed for better jobs, which keeps incomes low. Following that, limited access to healthcare is also crucial; if people are unhealthy, they cannot work effectively, which further hinders economic growth. Lastly, high levels of child labor are impactful but often stem from the other issues; when families are struggling financially, they may rely on children to work, which can perpetuate the cycle of poverty.