Question

because the byzantine empire was largely greek in language and culture, what was the biggest influence of byzantine/greek culture on russia?
the language
the alphabet
sculpture
architecture

Explanation:

The Byzantine (Greek - based) culture's biggest influence on Russia was the alphabet. The Cyrillic alphabet, which is used in Russia, has roots in Byzantine - related script development. While language, sculpture, and architecture were influenced, the alphabet (specifically the development of the Cyrillic alphabet from Byzantine - related scripts) was a fundamental and major influence.

Answer:

the alphabet