How did cultural diffusion most affect business during the medieval era? The use of standard Arabic coins made it easier to buy and sell goods.
Chinese numerals became commonly used and made trade easier.
Chinese weights became the standard and made it easier to buy and sell goods.
The use of Persian as one common language for merchants made trade easier.

A, the use of standard Arabic coins made it easier to buy and sell goods.

Explanation:

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a. would be the answer : )

explanation:

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration