Why Do Children Under 6 Months of Age,in Developing Countries,rarely

Why do children under 6 months of age,in developing countries,rarely suffer from malnutrition?

A) They are breast fed,and their mother's milk provides all required nutrition.
B) Children do not require as many different nutrients at that young age.
C) They have not been alive long enough for malnourishment to occur.
D) Most cultures in developing countries have the custom of providing scarce food to infants before other family members eat.
E) They have adequate food from their family's farm during this period of their life.