Why was silver money one of Charlemagne’s most important reforms? It enabled people to purchase goods at lower prices.
It allowed people to use one standard to buy and sell goods.
It gave the church an important role in international trade.
It helped merchants develop new products and services to sell.

It allowed people to use one standard to buy and sell goods.

Explanation:

Charlemagne was king of Frank and Lombards, under Pope Leo III, he was crown as the emperor of Rome in 800 A.D. He was known for his political capabilities and military skills.

To maintain an eased the trade of goods and services, the standard currency was introduced under Charlemagne when he declared silver coins minted throughout the Holy Roman Empire. It had its official value which helped merchants from England, France and other places to trade without worrying about the currency and price of the coins. A wool merchant from English could sell to a weaver in Flanders who could sell woollen products to a dyer in Cologne. Cologne merchants could trade to merchants in Venice who sold woollen materials to royalties.

D or A

Explanation:

becuase they are both giving a briefly description of it but i think that D has more details.