What is Sphere of Influence?

a country or area in which another country has power to affect developments although it has no formal authority.

Explanation:

That’s when countries have powers over developments

Explanation:

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

i would say it is a and b.

hope this