Which statement about the burden of childhood illness in the under-5 age group is true?
A.
The rate of under-5 mortality in sub-Saharan Africa is about 25 times that in high-income countries.
B.
About 80% of the under-5 deaths occur among neonates.
C.
Almost half of the under-5 mortality occurs in only four large countries.
D.
South Asia has the highest rates of under-5 mortality.