Mark the statement if it correctly describes the great wall.
a.
it was built to protect qin's empire from foreign invasion.
b.
it was built along the southern border of qin's empire.
c.
the entire structure was built during the qin dynasty.
d.
it is the longest man-made structure in the world.
e.
it can be seen from the moon.
multiple answer only got c.

I think A and D too. The primary purpose was always to protect the Chinese Empire from the Mongolians and other invaders. In 221-206 BC China's first emperor, Qin Shihuang, linked the walls of the three states in the north forming the Great Wall. Though it was eroded and been rebuilt, modified and extended It's over 6,000 km (3,700 miles) long.
And C is wrong because the Qin bulit some and the Ming Dynasty bulit some as well.