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