Over the Past 50 Years,deaths Among Children Have

Over the past 50 years,deaths among children have

A) declined in most high-income countries and have risen in most low-income countries.
B) declined in nearly all countries,including most low-income countries.
C) remained relatively unchanged in most high-income countries and have declined in most low-income countries.
D) declined in most high-income countries and have remained relatively unchanged in most low-income countries.