Zimbabwe and Ethiopia are typical sub-Saharan African countries, with regard to development. This means that __________.
a. they are average with regard to standard of living, income, and life expectancy
b. they have a very low standard of living, most people live in poverty, and life expectancy is below the world average
c. they have a high standard of living, most people make a good living, and life expectancy is higher than the world average
d. they have a high standard of living and average income, but life expectancy is below the world average