How did Roman culture survive the fall of the Western Roman Empire?

The western Empire spoke Latin and was Roman Catholic. The eastern Empire spoke Greek and worshipped under the Eastern Orthodox branch of the Christian church. Over time, the east thrived, while the west declined. In fact, after the western part of the Roman Empire fell, the eastern half continued to exist as the Byzantine Empire for hundreds of years. Therefore, the "fall of Rome" really refers only to the fall of the western half of the Empire.

Other fundamental problems contributed to the fall. In the economically ailing west, a decrease in agricultural production led to higher food prices. The western half of the empire had a large trade deficit with the eastern half. The west purchased luxury goods from the east but had nothing to offer in exchange. To make up for the lack of money, the government began producing more coins with less silver content. This led to inflation. Finally, piracy and attacks from Germanic tribes disrupted the flow of trade, especially in the west.

Explanation:

it should be d or b but i'm sure it's d

could you show the options for the answers? : )