What Is the Major Factor Determining Whether a Particular Slavic

What is the major factor determining whether a particular Slavic language uses the Latin alphabet or the Cyrillic alphabet in its written form?

A) the latitude of the country in which the language is spoken
B) the dominant religion of the people who speak that language
C) time period over which the language evolved
D) the political system of the country
E) the economic system of the country