Over the Past Three Decades in Brazil, What Has Been

Over the past three decades in Brazil, what has been the trend in children's health and body growth?

A) Children have gone from suffering malnutrition to being healthy.
B) Children have become more impoverished, leading to malnutrition.
C) Children have become less impoverished, which has led to malnutrition.
D) Children no longer suffer from undernutrition, but now face overnutrition.