Select the correct answer. What was one cause of the Decemberists revolt? a. the need for workers’ reforms

b. the creation of a new railway line

c. the outcome of the crimean war

d. the desire for a constitutional monarchy

The desire for a constitutional monarchy was one cause of the Decembrist revolt.
The Decembrist revolt occured in Imperial Russia on 26 December 1825 as a protest against Tsar Nicholas I's assumption of the throne after his elder brother Constantine removed himself from the line of succession.
In fact, during the reign of Tsar Alexander I, some members of the high aristocracy aimed to establish constitutional monarchy and abolish serfdom.

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.