According to the Text, Which Description Corresponds to the Measures

According to the text, which description corresponds to the measures of infant mortality rate?

A) the measure of a country's level of economic and social development in terms of factors such as health care, education, and proper sanitation
B) the measure of the use of birth control in a country's child-bearing women
C) the rate of appropriate and adequate child nutrition in a region
D) the rate of available physicians and primary child health care services per child-bearing mothers and infants in a region