Why Are the Leading Causes of Human Death in High-Income

Why are the leading causes of human death in high-income countries heart disease,stroke,and cancer,while in low-income countries infectious diseases are the leading causes of death?

A) High-income countries have sedentary life habits,excess food resources,and longer life expectancies.
B) High-income countries have larger ecological footprints.
C) High-income countries have larger population densities only.
D) High-income countries have larger population densities and are usually clustereD.
E) Genetic differences between populations causes the differences.