The Average Income in a Rich Country

The average income in a rich country

A) is about 5 times that in a poor country.Further,people in rich countries have longer life expectancy.
B) is about 5 times that in a poor country.However,people in rich countries have about the same life expectancy as those in poor countries.
C) is more than ten times that in a poor country.Further,people in rich countries have longer life expectancy.
D) is more than ten times that in poor country.However,people in rich countries have about the same life expectancy as those in poor countries.