Answer:
Based on the information provided, Japan experiences the lowest death rate of infants under 5. The infant mortality rate is given in the units "per 1,000," which represents the number of deaths per 1,000 live births.
According to the data given:
- United States: Infant mortality rate is 8 per 1,000 live births.
- Japan: Infant mortality rate is 3 per 1,000 live births.
- Somalia: Infant mortality rate is 180 per 1,000 live births.
- South Korea: Infant mortality rate is 5 per 1,000 live births.
Since Japan has the lowest infant mortality rate of 3 per 1,000 live births, it experiences the lowest death rate of infants under 5 compared to the other countries listed.