The han dynasty (206 bce – 220 ce) was weakened significantly because of?
a) an invasion of japanese warlords.
b) invasions of mongol tribes led by genghis khan.
c) security threats posed by nomadic tribes to the north.
d) trade imbalances caused by emperor ashoka's reign in india.

The correct option is D

During the Han Dynasty, their kings adopted the teachings of the great philosophers of antiquity, Lao-Tse and Confucius. The government developed well, achieving territorial expansion. Education and writing were encouraged in the newly invented rice paper. A great exchange of merchandise was promoted by the Silk Road, which goes from the Pacific Ocean to Persia and India.

the answer to number 5 is fort sumter