Mark the statement if it correctly describes achievements of the han dynasty.

a.
trade with other parts of the world was expanded.

b.
a civil service system based on merit was begun to fill government positions.

c.
territorial borders were expanded.

d.
silk was discovered.

e.
paper was developed.

f.
schools were set up to teach confucian ideas.

there are several answers, so if you think it is more than one that is good!