Infant mortality due to diarrhea is most common in

Rural communities of developing countries 

~have a nice day ♡

B. rural communities of developing countries

Explanation:

The infant mortality is the death of the young children that are the age of one and this is caused by the low and poor standards of living and poor conditions of the mothers. Alos premature births are the biggest reason for child mortality. Environmental and the social barriers are the basic causes of this mortality.

D.haka is the first answer and a.canberra is the second answer