Pl ! its a simple question, pls

mark the statement if it correctly explains how kublai khan tried to restore china from the ravages of war.

a.
commanded chinese workers to build and repair roads

b.
allowed traders, pilgrims, teachers, and artists to travel to china on the silk road

c.
treated the mongols and the chinese the same way, showing no preference to either group

d.
lengthened the grand canal, extending it to beijing

e.
continued the tradition of giving civil service exams to people who wanted to work in the government

To be honest i thinks its between the first answer and the third answer

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.