Answer:
D) infant mortality
Step-by-step explanation:
Infant mortality rate (IMR) is a ratio that measures how many infants (children under one year of age) die for every 1,000 live births. The IMR serves as an indicator of how healthy a country's population is.
The countries with the highest IMR are Afghanistan, Somalia, Central African Republic. While the countries with the lowest IMR are Japan, Iceland and Singapore.