13. Compared to previous wars throughout human history, World War II was different for civilians because
O A. they were spared due to a modern code of warfare.
O B. they were targeted and killed in greater numbers than in any war before.
O C. every nation, including Allies, was forced to participate in home front efforts.
O D. they mobilized for large-scale, total war for the first time.

‘yo mama attracted those indians.’ -mircromexsus

The answer is

The constant presence of diseases or infectious agents within a given geographic area or population group. it may also refer to the usual prevalence of a given disease with such area or group. it includes holoendemic and hyperendemic diseases. a holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). a hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. so probably family history.